← cd ~/errors
// entra id sign-in error · mfa and registration
AADSTS50087
SasRetryableError
What Microsoft says
A transient error has occurred during strong authentication. Please try again.
How to fix it
Microsoft doesn't publish a specific fix for this code beyond the description above. This site groups it under mfa and registration, based on that description, so start with the steps below.
How to investigate
- Open the sign-in log entry and check the Authentication details tab to see which methods were offered and which step failed.
- Check the user's registered methods under their Authentication methods blade.
- Check which Conditional Access policy or authentication strength asked for MFA.
- Search the sign-in logs for the request ID or correlation ID from the troubleshooting details on the error page.
Tools that help
The description is quoted from Microsoft's error code reference. The grouping and investigation steps are this site's guidance.