A customer changed the domain and the vcenter now has a new FQDN.
The new vCenter has been added to Veeam, all TAGs from the jobs are moved to the new FQDN as well.
The old vCenter can not be removed -> Unable to delete the selected host because it carries one or more backup infrastructure roles. It mentions only ONE backup job.
I get the same message if I try to remove the vcenter in the "Backup Infrastructur" tab and in the "Inventory" tab.
I checked the job up and down, but cannot find a reference to the vcenter.
Did you have checked inclusions/exclusions and all non default guest processing settings?
This are the places where you could have added the old vcenter with dedicated settings to the backup job.
If you can't find it, please open a support case and let our support engineer check the logs and the database.