Failed to add 'Application' role to

I have a fresh new Ubuntu server (Ionos VPS) where when trying to add a new Role, I get this error:

Failed to add 'Application' role to

Have tried with App / DB. How to troubleshoot this? The error is not very specific.

I have other servers connected (from other providers) and was able to add roles without error.

Looks like a bigger problem. "No usage data available" shows also. It cannot get data from the server.

Memory, disk, network...

"There has been an error while trying to fetch this data. Refresh the page to try again."

Had to allow ports 50000-50004 with Ionos default firewall policy. Thanks Adam!