Teams: Sign-in fails: AADSTS90023 "An arror occurred while processing incoming message"

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Teams: Sign-in fails: AADSTS90023 "An arror occurred while processing incoming message"

wimow 30

We have a Teams guest user who can't sign in on his Android phone. He enters user/password, then gets redirected, then Teams shows screen to select Tenant, when he select our organization, he gets redirected to this error: Teams: Sign-in fails: AADSTS90023 "An error occurred while processing incoming message"

He already tried to uninstall Teams, and reinstall.
We already tried to delete the account (both from Teams and Entra) and wait 48 hours before we created a new guest account in Entra and invited him again.
We already have many guest users, without issues, so it's not a settings issue.

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Answer 1

Hi @wimow,

Thank you for posting your question in the Microsoft Q&A forum. I’m sorry to hear about the issue you and your guest user are experiencing.

Based on my research, the error AADSTS90023: “An error occurred while processing incoming message” typically occurs when a guest user attempts to sign in to Teams on an Android device. This issue is related to token validation and re-authentication between tenants in a B2B (Business-to-Business) environment, where the authentication flow needs to process tokens across different organizations.

I really appreciate the steps you’ve already taken. Since these troubleshooting steps didn’t resolve the problem, I'm afraid this issue may need to be investigated from backend. The best way to further troubleshoot it is to report it to the related team.

You can do this by going to: Microsoft 365 Admin Center > Support > Help & Support, and include all details about the error, device type, and steps you’ve tried.

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Note: If you're an end user, please contact your IT administrator to follow these steps.

I hope you can understand that as a forum moderator, I don’t have access to backend systems or internal tools. The support team has higher permission than us to investigate the issue from background, they have more resource and correct escalation channel in handling this kind of issues. This will be the most efficient way to resolve the case for you and your guest user.

Additionally, if this response helps clarify the current situation and suggests the next actions you should take, please mark it as Accepted Answer so others in the community with similar issues can find it easily.

Thank you very much for your time and cooperation. If you have any updates or further questions, please feel free to leave a comment under this post. I’ll do my best to support you in every way I can.

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