Hope someone can help here. Community Edition, had 10 ESXi VMs being backed-up nicely for a long time. Introduced a couple of new VMs and decided that they were more important than than two that were were already being backed. Revoked the licences from two ov the VMs, license information now showing "10 (8 used)" as expected.
However, I am unable to assign licences to the new VMs. They do not appear in the list of licensed VMs and the "Assign" button is greyed out. I have tried removing the backups of the VMs I revoked licences from, but to no avail (they've obviously been removed from the backup job itself too).

What am I doing wrong here?
With thanks in advance.
Stuart Ford