Cannot Insert Excel in Word with Office 365
When adding an Excel object in Word, it fails and returns the following error: The program used to create this object is Excel. That program is either not installed on your computer or it is not responding. To edit this object, install Excel or ensure…
Office-Addin-TaskPane-React Dependency Vulnerabilities
Dear Microsoft, For an Outlook add-in in our organisation we use 'Office-Addin-TaskPane-React'. Following dependencies listed in package.json and package-json.lock have security vulnerabilities: Security IssueComponentCVE-2025-27152axios :…
Is adding just a Hosts element as a child element under version 1.0 of VersionOverrides a valid way to prevent our addin from appearing in Outlook for Mac
By accident, we found that if we add a Hosts element as a child element of VersionOverrides version 1.0 in the manifest, it will prevent the addin from appearing in Outlook for Mac and classic Outlook for Windows. See below ... <VersionOverrides…
How to Simulate Fallback for Unsupported Nested App Authentication in Outlook Add-in?
I'm currently implementing Nested App Authentication for an Outlook Add-in, and the authentication flow is working as expected when supported. However, I need to test the fallback mechanism that should trigger when Nested App Authentication is not…
HTML tag, <details/> and <summary/> not working in outlook
i am trying to send a HTML body as an email. i am using <details> and <summary> tag to create a dropdown. but i am not able to see the dropdown in outlook desktop app. here is the code i am using import smtplib from email.mime.multipart…

Is there a way to trigger Outlook-Add-Ins (Web) from external? (Custom event activation)
I am currently working on Office365 add-ins development and their communication via asp.net interfaces which are registered with entra id. I would like to open email templates from an external program. Templates can be created via ms-graph or by the…
Add a new tab in the web outlook
Hi, Aim: I want to add a new tab in the web outlook, the tab will be in the ribbon. There is any way to achieve that the tab will includes a buttons that trigger an API for sending email or do something else. Thanks in advance,
makeEwsRequestAsync- 9020 error and mail item is null Officejs Outlook
Web View : mail item instead of 9020 GenericResponseError. Outlook Classic: mail item is null
Microsoft EXCEL issue. Anywhere else on my PC i can copy a number and a drop down will pop up with how I can make a phone call
So as stated above I can copy a number anywhere and a pop up will appear and I can click an icon and make a phone call. I used to be able to do it in excel on the actual cell but cant anymore after my it reset my pc but I can do it everywhere else. But…
Skype for Business Persistent Chat Lag After Upgrading to Office 2024 LTSC
Hi everyone, We're currently using Skype for Business 2015 with Persistent Chat. Everything was working fine when we were on Office 2016. However, after upgrading to Office 2024 LTSC, we started experiencing significant lag in Persistent Chat. The issue…
Need information on Microsoft Message Trace GCC Support to request OAuth Token
I'm exploring MessageTrace report API: https://reports.office365.com/ecp/reportingwebservice/reporting.svc/MessageTrace, I can see that, to generate OAuth Token I need to make a GET call to: https://login.windows.net/<tenant-id>/oauth2/token . Does…
How to Reset MFA 365 Developer Program Tenant Admin Account
Hello I have a subscription to Microsoft 365 for developers. I am trying to log in with the administrator account but I no longer have the MFA active on my cell phone. Is it possible that from the support area they can perform a reset of MFA for this…
Attempting to save Options always results in error message "the end date you entered occurs before the start date"
Problem is ... In Outlook, File | Options, any attempt to save by clicking the OK button (even if you have made no changes) results in the error message "the end date you entered occurs before the start date" and no changes to the Options can…
Sideloading unified manifest Add-ins - Required office app versions?
The documentation at https://learn.microsoft.com/en-us/office/dev/add-ins/develop/convert-xml-to-json-manifest states: "Add-ins that use the unified manifest can be sideloaded only on Office Version 2304 (Build 16320.20000) or later."** …
What happened to Yammer and fielding community questions around Office 365 integrations??
I used to be able to login to yammer and no longer can. How do I send a quesin/issue to Dev support for Office 365 integration?
Can not Insert Picture to userform or image form
Hi , if i click to add picture to user for or any tools in VBA prosperities , no thing happened When I press the button bellow to add an image or background in all VBA Forms and tools , there is no response to the button and it is not possible to add…
Graph API Occasionally Missing Internet Message Headers in Response
We are using the Microsoft Graph API to retrieve email messages, and according to this article, we should be able to fetch internet message headers using the API. However, we’ve occasionally noticed that the internetMessageHeaders field is completely…
Fix Run-time error '1004'
How to I remove the Run-time error '1004', Method 'Name' of object 'Addln' failed. This Visual Basic for Applications window pops up every time I open Excel immediately after the new file appears, when I invoke "New" from the File menu and…
Office Add-in development: Can't sideload add-in in VSC; it returns 401 unauthorized despite having a 365 developer E5 subscription
In short, I am trying to do this tutorial in Visual Studio Code: https://learn.microsoft.com/en-us/training/modules/office-add-ins-outlook/ However, when asked to start the add-in, it throws an error and says "401 unauthorized". Searching about…
How to troubleshoot 'onMessageSend' event not triggering in Outlook Addin?
We have been working on new Outlook Addin using new Microsoft framework. We faced the challenge when trying to implement event for onMessageSend. The problem is that validateSubjectAndCC does not get invoked, so we don't see text in console log. We…