Hi Gert, Sorry to hear that it's not working for you. The "Endpoint Administrators" group is specifically for managing service connections. Would it be possible that your organization enforces certain policies/permissions that counteract this? I mean keep in mind that a DENY will have precedence over an ALLOW.

You can always try it would more permissions like using the "Project Administrators" group. But still, if a DENY is set if will never work.

Otherwise please try it in a lab environment first where you have full control.

Let me know if you have solved the issue!