I'm struggling with trying to add a service account to a group while following the new access docs. I found this thread and tried adding a service account to a new group I created called "Ansible Approvals" as a test. This isn't the final group, but I wanted to see if I could add it to a new group after I couldn't add it to another non-default group. It failed both times with:
Failed adding service account to group
The service account was not added successfully.
Request Id: 56fa191c67254a6eb52849043e6c7885
 
Service account name: ansible-partnereng-sign
Client ID: cf735411-4b54-4971-a984-5843a5bac08b