I think there might a bug with having more than one service accounts.
Scenario:
- create a service account.
- use it across projects! No problem
- go to setup for the org and use the + service account to add another service account. This seems to go fine. The key is created account is added.
- HOWEVER it seems this key does not have access to any of the projects. AND when trying to edit role an error is show ‘User xxx does not exist’
So I wonder - is the idea MAYBE that there can only be one service account? In that case the user interface is confusing 