Same issue here... I am interested in understanding the issue.
If I try to decrypt the error, it seems the user account needs to be added on the Microsoft side but no idea how to do that.
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Receiving error below when attempting to access this page:
https://microsoft.sharepoint.com/teams/apponboarding/Apps
I have tried with multiple users on Chrome and Safari and I'm still receiving the same error.
---ERROR---
Pick an account
Selected user account does not exist in tenant 'Microsoft' and cannot access the application '00000003-0000-0ff1-ce00-000000000000' in that tenant. The account needs to be added as an external user in the tenant first. Please use a different account.
Same issue here... I am interested in understanding the issue.
If I try to decrypt the error, it seems the user account needs to be added on the Microsoft side but no idea how to do that.