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The full description is:
AADSTS500210: Domain name does not match with the tenant identifier
If you are using Postman to authenticate against Entra External ID and you get this error, ensure that you have a “Host” header with the value:
external-tenant.ciamlogin.com
in the request.

All good!
Error “AADSTS500210” with Postman and Entra External ID was originally published in The new control plane on Medium, where people are continuing the conversation by highlighting and responding to this story.