Unable to log into Microsoft Outlook app on new Samsung S26+

Hi Larry Downing

I understand how frustrating this is, especially when it works on your other device but not on your new Samsung phone.

Could you please let me know whether you’ve already the Q&A Assist steps under your post yet? If so, what happened?

To help me guide you better, could you also confirm your account type:

• Outlook.com / Hotmail (personal), or
• Microsoft 365 (work/school), or
• another provider (Gmail, Yahoo, etc.)

In the meantime, please try these checks:

1, Check sign‑in outside the app on the same phone

On your Samsung device, try signing in to your account directly in a browser (for example, Outlook.com).

• If sign‑in also fails there, the issue is likely account or security‑related
• If it works in the browser, the issue is specific to the Outlook app on that device

2, Review device security / browser handoff

On Samsung devices, this can be affected by system settings:

• Make sure Android System WebView and Chrome are fully up to date from the Play Store
• Temporarily disable features like Secure Folder / Private DNS / VPN / Ad blocker (if enabled), then try again

3, Check Internet connection:

• Ensure that your device is connected to the internet. Open a web browser and try loading a website like Google to confirm connectivity.
• If you are having issues with your internet, try toggling Airplane mode on and off to reset your network connections.

Please feel free to let me know how it goes. Thank you so much for your patience and understanding.

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".    

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.

Follow these steps on the Samsung S26+ to troubleshoot the Outlook for Android sign-in issue:

1. Make sure the latest Outlook for Android is installed from the Google Play Store. Older versions can fail sign-in when security standards change. If prompted repeatedly for credentials, update using the latest version as recommended in "Can't sign in to the Outlook mobile app".
2. Clear Outlook’s local data again using the supported reset guidance:
   • Close Outlook.
   • Go to Android Settings → Apps → Outlook.
   • Force stop Outlook.
   • Clear Cache and Clear Data.
   • Reopen Outlook and try adding the account again. If issues persist, fully uninstall Outlook, restart the phone, then reinstall Outlook and retry sign-in.
3. If this is a Microsoft personal account (Outlook.com, Hotmail, Live, etc.):
   • Use the Microsoft sign-in helper tool from "Can't sign in to the Outlook mobile app" to check for account-side problems: follow the Start link from that article on a browser and complete the steps.
   • If the tool reports an issue, complete the recommended recovery or security steps, then try signing in again on the Samsung.
4. If this is a Microsoft 365 work or school account:
   • Confirm with the Microsoft 365 admin that the account is active and allowed to sign in on mobile (no conditional access or device restrictions blocking Android).
   • If self-service password reset is enabled, use the Reset password link from the article, then sign in again in Outlook for Android.
5. If the account is non-Microsoft (Gmail, Yahoo, iCloud, etc.):
   • Verify the account can sign in via its own webmail in a browser on the Samsung.
   • If web sign-in fails, contact that provider’s support as advised in "Can't sign in to the Outlook mobile app".
6. If the error persists only on the Samsung after these steps and the same account works on iOS and on the web, use the general Outlook for Android troubleshooting:
   • Check the "Outlook for Android Help" → Troubleshooting → Common Issues, especially:
     • "How do I clear the cache or locally reset/refresh the client/app?"
     • "How do I manually enter my Exchange account information?" (if this is an Exchange/Microsoft 365 account).
   • If the account is Exchange-based and disabled on mobile, review "Why is my Microsoft Exchange account disabled?" in the same article and work with the admin if needed.
7. If none of the above resolves the 2605 server-side error and the account works on other devices, contact Microsoft support or the Microsoft 365 admin (for work/school accounts) as the issue is likely server-side or policy-related for that specific Android device.

References:

• Troubleshoot Outlook mobile issues
• Can't sign in to the Outlook mobile app
• Outlook for Android Help