Thank you for posting this in Microsoft Q&A.
Looks like you are getting an error like below,
The selected user account does not exist in the "Microsoft Services" tenant and cannot access the application "...26e160ff0fc6". First, the account needs to be added as an external user in the tenant. Use a different account.
I understand that when you're trying to login to the Entra ID Portal or trying to access any Entra services, you're running into the error message above.
To hopefully help you in the right direction or resolve your issue, I'll share my findings below.
Findings:
When looking into your error message, I noticed that there are a few potential causes for this and to gain a better understanding of your issue:
- If you've been able to login previously, can you try to login in using a private browsing session?
- Are you able to share any login details to include a Correlation ID or timestamp? Keep in mind PII.
If your user belongs to multiple tenants, you can try to navigate to the specific tenant using one of the URLs below.
#Note: If you're still having issues, please try this from a private browsing session
Additional Link:
I hope this helps!
If you have any other questions, please let me know. Thank you for your time and patience throughout this issue.
Let me know if you have any further questions.
Please "Accept the answer" if the information helped you. This will help us and others in the community as well.