I'm using VSA 13.0.1 and backup HPE VME Windows 10 VM. Backup and Restore entire VM work well, but I meet the error when I try to restore guest file by Veeam explorer. I've already tried to turn off firewall, UAC, allow File and Printer Sharing but it didn't work.
I did some tests with adding my windows machine to a domain.
FLR worked for me in both cases - when specifying login through "domain\username" and through "username@domain".
What about firewall settings on VBR side? You can try disabling firewall on VBR as well and check restore once again.