I've searched for a easy way to change the owner of all backup groups in a namespace.
Instead of doing this in the web gui, I've built a little helper script.
So, here it is, if someone has the same wish to do this not via click :cool:
I just ran into a similar problem in a Proxmox 8 ==> Proxmox 9 update:
After adding a V9 Node to the cluster, logging into the Web UI only worked on the new node, logging into the old nodes failed with the error: authentication failure...