Hi
@Wernfried_Domscheit,
Welcome to the MongoDB Community forums!
As per the MongoDB documentation,
You can’t edit roles for specific users on the Access Manager page if you configure role mappings for Identity Provider groups.
Could you confirm if you have configured this using the IdP groups?
If yes, you can follow the steps documented here to edit the role mappings in your organization and its projects.
I hope it helps!
Best regards,
Kushagra