How to add Outlook to GMail on my Android phone?

Question

How to add Outlook to GMail on my Android phone?

Roger Blair 365

I run Windows 11 Pro on a Dell Inspiron laptop. I recently reset my Android 12 phone, and I cannot add Outlook back to GMail. Every time I try to add Outlook, I get an "Unable to authenticate". I follow the instructions, but I get an authentication message every time. Am I missing something, or is there something wrong with my account?

Roger Blair 365 Reputation points

2026-09-04T19:45:20.77+00:00

AI answer:

To add an Outlook.com account to the Gmail app on Android and avoid calendar/contact sync problems, use Exchange and Microsoft 365 in Gmail, not Outlook, Hotmail, and Live. Steps: Update the Gmail app from Google Play if an update is available. Open Gmail. Go to Menu > Settings > Add account > Exchange and Microsoft 365. Enter the full Outlook email address and tap Next. Enter the password and tap Next. Follow any prompts for security or device permissions. If an email appears in the new inbox saying Action Required to Sync Email, open it and tap Use another Mail app instead. If Android shows Unable to sync calendar and contacts, tap the notification and then tap Allow. [---]

The AI answer doesn't help. When I enter my Hotmail address in the "Exchange and Office 365" window, I'm immediately told to use the "LOive, Hotmail" page. When I enter manual setup, I don't get to enter the outgoing mail info, and I still get rejected.
Stefan Blom 351K Reputation points MVP Volunteer Moderator

2026-09-06T15:05:13.3133333+00:00

Since the AI-generated reply from "AI answer" didn't help, you can reject it.

2 answers

Your answer

Roger Blair 365 Reputation points

2026-09-04T19:45:20.77+00:00

AI answer:

To add an Outlook.com account to the Gmail app on Android and avoid calendar/contact sync problems, use Exchange and Microsoft 365 in Gmail, not Outlook, Hotmail, and Live. Steps: Update the Gmail app from Google Play if an update is available. Open Gmail. Go to Menu > Settings > Add account > Exchange and Microsoft 365. Enter the full Outlook email address and tap Next. Enter the password and tap Next. Follow any prompts for security or device permissions. If an email appears in the new inbox saying Action Required to Sync Email, open it and tap Use another Mail app instead. If Android shows Unable to sync calendar and contacts, tap the notification and then tap Allow. [---]

The AI answer doesn't help. When I enter my Hotmail address in the "Exchange and Office 365" window, I'm immediately told to use the "LOive, Hotmail" page. When I enter manual setup, I don't get to enter the outgoing mail info, and I still get rejected.
Stefan Blom 351K Reputation points MVP Volunteer Moderator

2026-09-06T15:05:13.3133333+00:00

Since the AI-generated reply from "AI answer" didn't help, you can reject it.

Answer 1

To add an Outlook.com account to the Gmail app on Android and avoid calendar/contact sync problems, use Exchange and Microsoft 365 in Gmail, not Outlook, Hotmail, and Live.

Steps:

Update the Gmail app from Google Play if an update is available.
Open Gmail.
Go to Menu > Settings > Add account > Exchange and Microsoft 365.
Enter the full Outlook email address and tap Next.
Enter the password and tap Next.
Follow any prompts for security or device permissions.
If an email appears in the new inbox saying Action Required to Sync Email, open it and tap Use another Mail app instead.
If Android shows Unable to sync calendar and contacts, tap the notification and then tap Allow.

If Unable to authenticate continues, try manual setup in Gmail:

Open Gmail > Settings > Add account > Other.
Enter the full Outlook email address.
Tap Manual Setup > Exchange.
Enter the password.
Use these settings for an Outlook.com account:
- Server: eas.outlook.com
- Port: 443 or 993
- Security type: SSL/TLS
For outgoing mail:
- SMTP Server: smtp-mail.outlook.com
- Security Type: TLS
- Port Number: 587

If the account is a Microsoft 365 work or school account instead of a personal Outlook.com account, the server is outlook.office365.com and extra security prompts may appear.

If the account still fails in Gmail, adding the account in Outlook for Android is another supported setup path:

Open Outlook for Android.
Go to Menu > Settings > Account > Add Account.
Select Add an email account.
Enter the email address and complete authentication.

Answer 2

Hendrix-V 18,510 Microsoft External Staff Moderator

Hi Roger Blair,

Since Gmail is automatically redirecting your Hotmail address to the"Outlook, Hotmail, and Live" sign-in option and the manual setup process does not complete, this may indicate that the authentication request is not being accepted during the initial account verification stage.

As a quick check, please try the following:

Sign in to your Hotmail account using a web browser at Outlook.com.
Review the Recent activity page for any pending security verification requests or blocked sign-in attempts.
If prompted, complete any account verification steps and then try adding the account to Gmail again.

If the account signs in normally through the browser but Gmail continues to reject authentication, testing the same account in the Outlook for Android app can help determine whether the issue is specific to the Gmail app's connection process.

Please let me know whether you're able to access the account successfully through the web browser and if you notice any security alerts on the account. That information may help narrow down the cause.

I hope this helps point you in the right direction, and I look forward to your update. Feel free to ask me by clicking "Add Comment" or "Add Answer" if you cannot add comment so your response will be visible. Thanks for your effort.

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Roger Blair 365 Reputation points

2026-09-05T13:28:08.65+00:00

All accesses have been normal; no rejections seen.
Hendrix-V 18,510 Reputation points Microsoft External Staff Moderator

2026-09-06T04:33:40.7633333+00:00
Hi Roger Blair,

Since you've confirmed there are no sign-in alerts, blocked attempts, or security challenges on the account, that suggests the Microsoft account itself is authenticating normally. The next useful step is to determine whether the issue is specific to the Gmail app on the device.

You could try:

Remove the existing Hotmail/Outlook entry (if partially added) from Gmail > Settings > Accounts.

Clear the Gmail app cache in Android Settings > Apps > Gmail > Storage > Clear Cache.

Restart the phone.

Attempt to add the account again.

If the same "Unable to authenticate" message appears, it may help to note the exact wording of the error or share a screenshot (with personal information removed). A more specific authentication message can often point to the next troubleshooting step.

I appreciate you providing the additional details.
Roger Blair 365 Reputation points

2026-09-06T10:03:07.6133333+00:00

The exact message is "Unable to authenticate".
Roger Blair 365 Reputation points

2026-09-06T18:38:04.0666667+00:00

I can access my account through the "Outlook for Android" app, but I can't add it to GMail.
Hendrix-V 18,510 Reputation points Microsoft External Staff Moderator

2026-09-07T08:34:55.6166667+00:00
Hi Roger Blair,

The fact that you're able to sign in successfully through both a web browser and the Outlook for Android app is a helpful result. It indicates that the account credentials are valid and that the account itself is accessible. Since the authentication error occurs only when adding the account to the Gmail app, the behavior appears to be isolated to Gmail's connection process for this account.

As a quick test, you may want to:

Update Gmail to the latest version from the Google Play Store.

Clear the Gmail app cache (Settings > Apps > Gmail > Storage > Clear Cache).

Restart the device and try adding the account again.

If the account continues to display only "Unable to authenticate" in Gmail while working normally in Outlook for Android, that comparison helps narrow the issue to the Gmail app's account integration rather than the Microsoft account itself.

Thank you for taking the time to share the troubleshooting results.