How can we see here, vCenter IP/FQDN is not possible to change inside of Veeam B&R.
In my case I put the IP of vCenter server on Veeam Backup & Replication and now I’d like to change it to a hostname accordingly the DNS server name.
So, first of all we need to open the Console / PowerShell on burger menu of Veeam B&R.
So, at this moment we need type the command:
$Servers = Get-VBRServer -name "old-name-or-ip"
On my case the IP of my vCenter server is 192.168.10.100.
After that we just need type the following command:
On my scenario it is ROM2SRVVLVC01.
And now, with this two only commands we can see that the vCenter name was changed on Veeam Backup & Replication:
To finish I just rescan the vCenter server again to see all the set up is ok.