Unable to create Group Workspaces

I am unable to create (another) group workspace. I am using Power BI Pro (active license), and I have updated the Enterprise Gateway to the latest version (not sure if that is important).

I have been able to create one group previously (this was during the trial period of the Pro version I believe), but now that I have a license it does not seem to work.

I have browsed through the forum and found similar issues with Workspace management, but I could not solve mine by working out those solutions.

Here are the error details: