Build PowerShell scripts with Microsoft Graph

Article
Developer (Beginner)
21 minutes to complete

This tutorial teaches you how to build a PowerShell script that uses the Microsoft Graph API to access data on behalf of a user.

Note

To learn how to use Microsoft Graph to access data using app-only authentication, see this app-only authentication tutorial.

In this tutorial, you will:

Tip

As an alternative to following this tutorial, you can download the completed code through the quick start tool, which automates app registration and configuration. The downloaded code works without any modifications required.

You can also download or clone the GitHub repository and follow the instructions in the README to register an application and configure the project.

Prerequisites

Before you start this tutorial, you should have PowerShell installed on your development machine. PowerShell 5.1 is the minimum requirement, but PowerShell 7 is recommended.

You should also have a Microsoft work or school account with an Exchange Online mailbox. If you don't have a Microsoft 365 tenant, you might qualify for one through the Microsoft 365 Developer Program; for details, see the FAQ. Alternatively, you can sign up for a 1-month free trial or purchase a Microsoft 365 plan.

Note

This tutorial was written with PowerShell 7.2.2 and Microsoft Graph PowerShell SDK version 1.9.5. The steps in this guide may work with other versions, but that has not been tested.

Register the app in the portal

20 minutes remaining

In this exercise you will register a new application in Azure Active Directory to enable user authentication. You can register an application using the Microsoft Entra admin center, or by using the Microsoft Graph PowerShell SDK.

Register application for user authentication

In this section you will register an application that supports user authentication using device code flow.

Note

Registering an application for user authentication for the Microsoft Graph PowerShell SDK is optional. The SDK has it's own application registration and corresponding client ID. However, using your own application ID allows for greater control over permission scopes for a particular PowerShell script.

Microsoft Entra admin center
PowerShell

Open a browser and navigate to the Microsoft Entra admin center and login using a Global administrator account.
Select Microsoft Entra ID in the left-hand navigation, expand Identity, expand Applications, then select App registrations.
Select New registration. Enter a name for your application, for example, Graph User Auth Tutorial.

Set Supported account types as desired. The options are:

Option	Who can sign in?
Accounts in this organizational directory only	Only users in your Microsoft 365 organization
Accounts in any organizational directory	Users in any Microsoft 365 organization (work or school accounts)
Accounts in any organizational directory ... and personal Microsoft accounts	Users in any Microsoft 365 organization (work or school accounts) and personal Microsoft accounts

Leave Redirect URI empty.
Select Register. On the application's Overview page, copy the value of the Application (client) ID and save it, you will need it in the next step. If you chose Accounts in this organizational directory only for Supported account types, also copy the Directory (tenant) ID and save it.
Select Authentication under Manage. Locate the Advanced settings section and change the Allow public client flows toggle to Yes, then choose Save.

To use PowerShell, you'll need the Microsoft Graph PowerShell SDK. If you do not have it, see Install the Microsoft Graph PowerShell SDK for installation instructions.

Important

The PowerShell script requires a work/school account with the Application administrator, Cloud application administrator, or Global administrator role. If your account has the Application developer role, you can register in the Microsoft Entra admin center.

Create a new file named RegisterAppForUserAuth.ps1 and add the following code.

param(
  [Parameter(Mandatory=$true,
  HelpMessage="The friendly name of the app registration")]
  [String]
  $AppName,

  [Parameter(Mandatory=$false,
  HelpMessage="The sign in audience for the app")]
  [ValidateSet("AzureADMyOrg", "AzureADMultipleOrgs", `
  "AzureADandPersonalMicrosoftAccount", "PersonalMicrosoftAccount")]
  [String]
  $SignInAudience = "AzureADandPersonalMicrosoftAccount",

  [Parameter(Mandatory=$false)]
  [Switch]
  $StayConnected = $false
)

# Tenant to use in authentication.
# See https://learn.microsoft.com/azure/active-directory/develop/v2-oauth2-device-code#device-authorization-request
$authTenant = switch ($SignInAudience)
{
  "AzureADMyOrg" { "tenantId" }
  "AzureADMultipleOrgs" { "organizations" }
  "AzureADandPersonalMicrosoftAccount" { "common" }
  "PersonalMicrosoftAccount" { "consumers" }
  default { "invalid" }
}

if ($authTenant -eq "invalid")
{
  Write-Host -ForegroundColor Red "Invalid sign in audience:" $SignInAudience
  Exit
}

# Requires an admin
Connect-MgGraph -Scopes "Application.ReadWrite.All User.Read" -UseDeviceAuthentication -ErrorAction Stop

# Get context for access to tenant ID
$context = Get-MgContext -ErrorAction Stop

if ($authTenant -eq "tenantId")
{
  $authTenant = $context.TenantId
}

# Create app registration
$appRegistration = New-MgApplication -DisplayName $AppName -SignInAudience $SignInAudience `
 -IsFallbackPublicClient -ErrorAction Stop
Write-Host -ForegroundColor Cyan "App registration created with app ID" $appRegistration.AppId

# Create corresponding service principal
if ($SignInAudience -ne "PersonalMicrosoftAccount")
{
  New-MgServicePrincipal -AppId $appRegistration.AppId -ErrorAction SilentlyContinue `
   -ErrorVariable SPError | Out-Null
  if ($SPError)
  {
    Write-Host -ForegroundColor Red "A service principal for the app could not be created."
    Write-Host -ForegroundColor Red $SPError
    Exit
  }

  Write-Host -ForegroundColor Cyan "Service principal created"
}

Write-Host
Write-Host -ForegroundColor Green "SUCCESS"
Write-Host -ForegroundColor Cyan -NoNewline "Client ID: "
Write-Host -ForegroundColor Yellow $appRegistration.AppId
Write-Host -ForegroundColor Cyan -NoNewline "Auth tenant: "
Write-Host -ForegroundColor Yellow $authTenant

if ($StayConnected -eq $false)
{
  Disconnect-MgGraph | Out-Null
  Write-Host "Disconnected from Microsoft Graph"
}
else
{
  Write-Host
  Write-Host -ForegroundColor Yellow `
   "The connection to Microsoft Graph is still active. To disconnect, use Disconnect-MgGraph"
}

Save the file.
Open PowerShell and change the current directory to the location of RegisterAppForUserAuth.ps1.

Run the following command, replacing <audience-value> with the desired value (see table below).

.\RegisterAppForUserAuth.ps1 -AppName "Graph User Auth Tutorial" -SignInAudience <audience-value>

SignInAudience value	Who can sign in?
`AzureADMyOrg`	Only users in your Microsoft 365 organization
`AzureADMultipleOrgs`	Users in any Microsoft 365 organization (work or school accounts)
`AzureADandPersonalMicrosoftAccount`	Users in any Microsoft 365 organization (work or school accounts) and personal Microsoft accounts
`PersonalMicrosoftAccount`	Only personal Microsoft accounts

Follow the prompt to open https://microsoft.com/devicelogin in a browser, enter the provided code, and complete the authentication process.
Copy the Client ID and Auth tenant values from the script output. You will need these values in the next step.
```
SUCCESS
Client ID: 2fb1652f-a9a0-4db9-b220-b224b8d9d38b
Auth tenant: common
```

Note

Notice that you did not configure any Microsoft Graph permissions on the app registration. This is because the sample uses dynamic consent to request specific permissions for user authentication.

Add user authentication

17 minutes remaining

In this section you will authenticate a PowerShell session as a user for Microsoft Graph. This is required to obtain the necessary OAuth access token to call the Microsoft Graph.

The Microsoft Graph PowerShell SDK provides two authentication methods for user authentication: interactive browser and device code authentication. Interactive browser authentication uses a device's default browser to allow the user to sign in. Device code authentication allows authentication in environments that do not have a default browser. In this exercise you will use device code authentication.

Important

If you do not already have the Microsoft Graph PowerShell SDK installed, install it now before proceeding.

Authenticate the user

Open PowerShell and use the following command to set the $clientID session variable, replacing <your-client-id> with the client ID of your app registration.
```
$clientId = <your-client-id>
```
Set the $tenantId session variable. If you chose the option to only allow users in your organization to sign in when registering your application, replace <tenant-id> with your organization's tenant ID. Otherwise, replace with common.
```
$tenantId = <tenant-id>
```

Set the $graphScopes session variable.

$graphScopes = "user.read mail.read mail.send"

Use the following command to authenticate the user inside the current PowerShell session.
```
# Authenticate the user
Connect-MgGraph -ClientId $clientId -TenantId $tenantId -Scopes $graphScopes -UseDeviceAuthentication
```
Tip

If you would prefer to use interactive browser authentication, omit the -UseDeviceAuthentication parameter.
Open a browser and browse to the URL displayed. Enter the provided code and sign in.

Important

Be mindful of any existing Microsoft 365 accounts that are logged into your browser when browsing to https://microsoft.com/devicelogin. Use browser features such as profiles, guest mode, or private mode to ensure that you authenticate as the account you intend to use for testing.

Once completed, return to the PowerShell window. Run the following command to verify the authenticated context.

# Get the Graph context
Get-MgContext

ClientId              : 2fb1652f-a9a0-4db9-b220-b224b8d9d38b
TenantId              : 601faea3-be45-4960-898f-92b379b17cd9
CertificateThumbprint :
Scopes                : {Mail.Read, Mail.Send, openid, profile…}
AuthType              : Delegated
AuthProviderType      : DeviceCodeProvider
CertificateName       :
Account               : [email protected]
AppName               : PowerShell Graph Tutorial
ContextScope          : CurrentUser
Certificate           :
PSHostVersion         : 2022.4.1
ClientTimeout         : 00:05:00

Get user

12 minutes remaining

In this section you will get the authenticated user.

In your authenticated PowerShell session, run the following command to get the current context. The context provides information to identify the authenticated user.
```
$context = Get-MgContext
```
Run the following command to get the user from Microsoft Graph.
```
# Get the authenticated user by UPN
$user = Get-MgUser -UserId $context.Account -Select 'displayName, id, mail, userPrincipalName'
```
Tip

You can add the -Debug switch to the previous command to see the API request and response.

Run the following commands to output user information.

Write-Host "Hello," $user.DisplayName
# For Work/school accounts, email is in Mail property
# Personal accounts, email is in UserPrincipalName
Write-Host "Email:", ($user.Mail ?? $user.UserPrincipalName)

Hello, Megan Bowen!
Email: [email protected]

Code explained

Consider the command used to get the authenticated user. It's a seemingly simple command, but there are some key details to notice.

Accessing 'me'

The Get-MgUser command builds a request to the Get user API. This API is accessible two ways:

GET /me
GET /users/{user-id}

The Microsoft Graph PowerShell SDK does not support the GET /me API endpoint. In order to use the GEt /users/{user-id} endpoint, we must provide a value for the {user-id} parameter. In the example above, the $context.Account value is used. This value contains the authenticated user's user principal name (UPN).

Requesting specific properties

The function uses the -Select parameter on the command to specify the set of properties it needs. This adds the $select query parameter to the API call.

Strongly-typed return type

The function returns a MicrosoftGraphUser object deserialized from the JSON response from the API. Because the command uses -Select, only the requested properties will have values in the returned object. All other properties will have default values.

List inbox

10 minutes remaining

In this section you will list messages in the user's email inbox.

In your authenticated PowerShell session, verify that the $user variable is set.
```
PS > $user.DisplayName
Megan Bowen
```

Run the following command to list the user's inbox.

Get-MgUserMailFolderMessage -UserId $user.Id -MailFolderId Inbox -Select `
  "from,isRead,receivedDateTime,subject" -OrderBy "receivedDateTime DESC" `
  -Top 25 | Format-Table Subject,@{n='From';e={$_.From.EmailAddress.Name}}, `
  IsRead,ReceivedDateTime

Review the output.

Subject                                    From                    IsRead ReceivedDateTime
-------                                    ----                    ------ ----------------
Updates from Ask HR and other communities  Contoso Demo on Yammer  False  4/19/2022 10:19:02 PM
Employee Initiative Thoughts               Patti Fernandez         False  4/19/2022 3:15:56 PM
Voice Mail (11 seconds)                    Alex Wilber             False  4/18/2022 2:24:16 PM
Our Spring Blog Update                     Alex Wilber             True   4/18/2022 1:52:03 PM
Atlanta Flight Reservation                 Alex Wilber             False  4/13/2022 2:30:27 AM
Atlanta Trip Itinerary - down time         Alex Wilber             False  4/12/2022 4:46:01 PM

Code explained

Consider the command used to list the user's inbox

Accessing well-known mail folders

The Get-MgUserMailFolderMessage command builds a request to the List messages API, specifically using the GET /users/{user-id}/mailFolders/{folder-id}/messages endpoint. Using that endpoint, the API only returns messages in the requested mail folder. In this case, because the inbox is a default, well-known folder inside a user's mailbox, it's accessible via its well-known name: -MailFolderId Inbox. Non-default folders are accessed the same way, by replacing the well-known name with the mail folder's ID property. For details on the available well-known folder names, see mailFolder resource type.

Accessing a collection

Unlike the Get-MgUser command from the previous section, which returns a single object, this method returns a collection of messages. Most APIs in Microsoft Graph that return a collection do not return all available results in a single response. Instead, they use paging to return a portion of the results while providing a method for clients to request the next "page".

Default page sizes

APIs that use paging implement a default page size. For messages, the default value is 10. Clients can request more (or less) by using the $top query parameter. In the Microsoft Graph PowerShell SDK, this is accomplished with the -Top 25 parameter.

Note

The value passed via -Top is an upper-bound, not an explicit number. The API returns a number of messages up to the specified value.

Sorting collections

The function uses the -OrderBy parameter on the request to request results sorted by the time the message is received (receivedDateTime property). It includes the DESC keyword so that messages received more recently are listed first. This adds the $orderby query parameter to the API call.

Send mail

8 minutes remaining

In this section you will send an email message as the authenticated user.

In your authenticated PowerShell session, verify that the $user variable is set.
```
PS > $user.DisplayName
Megan Bowen
```

Use the following command to define an object representing the request body for the Send mail API.

$sendMailParams = @{
    Message = @{
        Subject = "Testing Microsoft Graph"
        Body = @{
            ContentType = "text"
            Content = "Hello world!"
        }
        ToRecipients = @(
            @{
                EmailAddress = @{
                    Address = ($user.Mail ?? $user.UserPrincipalName)
                }
            }
        )
    }
}

Use the following command to send the message.
```
Send-MgUserMail -UserId $user.Id -BodyParameter $sendMailParams
```
Note

If you are testing with a developer tenant from the Microsoft 365 Developer Program, the email you send might not be delivered, and you might receive a non-delivery report. If this happens to you, please contact support via the Microsoft 365 admin center.
To verify the message was received, repeat the Get-MgUserMailFolderMessage command from the previous step.

Code explained

Consider the commands used to send a message.

Sending mail

The Send-MgUserMail command builds a request to the Send mail API.

Creating objects

Unlike the previous calls to Microsoft Graph that only read data, this call creates data. To do this with the SDK you create an object representing the request body, set the desired properties, then pass it in the BodyParameter parameter.

Optional: add your own code

5 minutes remaining

In this section you will use your own Microsoft Graph PowerShell SDK commands. This could be a code snippet from Microsoft Graph documentation or Graph Explorer, or code that you created. This section is optional.

Choose an API

Find an API in Microsoft Graph you'd like to try. For example, the Create event API. You can use one of the examples in the API documentation, customize an API request in Graph Explorer and use the generated snippet, or use the Find-MgGraphCommand command to find the corresponding command.

For example, one of the API endpoints to create an event is POST /users/{id | userPrincipalName}/events. You can use this to find the corresponding PowerShell command.

PS > Find-MgGraphCommand -Uri "/users/{id | userPrincipalName}/events" -Method "POST"

   APIVersion: v1.0

Command         Module   Method URI                     OutputType           Permissions           Variants
-------         ------   ------ ---                     ----------           -----------           --------
New-MgUserEvent Calendar POST   /users/{user-id}/events IMicrosoftGraphEvent {Calendars.ReadWrite} {Create1, CreateExp…

   APIVersion: beta

Command         Module   Method URI                     OutputType            Permissions           Variants
-------         ------   ------ ---                     ----------            -----------           --------
New-MgUserEvent Calendar POST   /users/{user-id}/events IMicrosoftGraphEvent1 {Calendars.ReadWrite} {Create, CreateExp…

The output indicates that the New-MgUserEvent command is the corresponding command.

Configure permissions

Check the Permissions section of the reference documentation for your chosen API to see which authentication methods are supported. Some APIs don't support user (delegated) authentication, or personal Microsoft accounts, for example.

Disconnect the current session (Disconnect-MgGraph) and reconnect with the required permission in the -Scopes parameter.

Tip

Using the -ForceRefresh parameter with the Connect-MgGraph command ensures that newly configured permissions are applied.

Run the command

Now that you are connected with the required permissions, run your chosen command.

Share via

Build PowerShell scripts with Microsoft Graph

Prerequisites

Register the app in the portal

Register application for user authentication

Add user authentication

Authenticate the user

Get user

Code explained

Accessing 'me'

Requesting specific properties

Strongly-typed return type

List inbox

Code explained

Accessing well-known mail folders

Accessing a collection

Default page sizes

Sorting collections

Send mail

Code explained

Sending mail

Creating objects

Optional: add your own code

Choose an API

Configure permissions

Run the command

Congratulations!