← cd ~/errors
// entra id sign-in error · accounts, passwords and sessions
AADSTS50128
Invalid domain name
What it means
No tenant-identifying information was found in the request.
How to fix it
Check the username's domain is verified in a tenant, and the app uses the right authority URL.
How to investigate
- Confirm which account the user actually signed in with. A personal account or the wrong tenant causes many of these.
- Check the user object: enabled, licensed, in the right tenant, and with no recent password change or reset.
- Look at the sign-in logs over a few days for a pattern, such as repeated failures from one IP address.
- Search the sign-in logs for the request ID or correlation ID from the troubleshooting details on the error page.
Tools that help
Error names and meanings follow Microsoft's error code reference. The fixes are this site's guidance.