Unable to sign in to Microsoft 365 on devices only

Question

For some reasons, I can use microsoft teams or outlook on the web version but I can't on my laptop. I am in continuous loop that asks me for MFA and never authenticate me even after i have supplied it.

Thanks!

Yannick

Answer 1

It sounds like you're experiencing issues with signing in to Microsoft 365 applications on your laptop, particularly with multi-factor authentication (MFA). This could be due to a few reasons, including issues with the authentication process or conflicts with security software.

Here are some steps you can take to troubleshoot the issue:

1. Check for Security Software Conflicts: Sometimes, security software can interfere with the sign-in process. Try temporarily uninstalling any security software on your laptop and see if that resolves the issue.
2. Reinstall WAM Plug-ins: If the issue persists, you may need to reinstall the Windows Authentication Manager (WAM) plug-ins. You can do this using PowerShell commands to register the necessary packages.
3. Monitor for Errors: After making these changes, monitor the situation for 48 hours to see if the issue reoccurs. If it does, consider reaching out to Microsoft Support for further assistance.
4. Avoid Impersonation Techniques: Ensure that you are not using impersonation methods (like "Run as administrator") when starting Microsoft 365 apps, as this can interfere with the authentication flow.
5. Sign Out and Restart: Manually sign out of all accounts in the Office app, restart the app, and try signing in again.

These steps should help you resolve the sign-in issues you're facing on your laptop.

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References:

• Can't sign in to Microsoft 365 desktop applications
• Error code 80070520, -2147023584, or 2147943712 when signing in to Microsoft 365 apps