Veeam RHV Backup 12.1 RemoveImageTicketVDS failed

[humnab]

Hello,

we used Veeam 12 since oVirt 4.5.3 an had no problems until Veeam 12.1, now we get for many VM backup jobs (as far as could investige until now it only happens with incremental backups):

command RemoveImageTicketVDS failed: Image daemon request failed: 'status=500, reason=Internal Server Error, error=Server failed to perform the request, check logs\n'

Veeam refuses to support us as we are not on official RHV, but the problems startet with the Veeam update to 12.1 and updating Engine to 4.5.5 and 4.5.6 / NodeNG to 4.5.5 didn't make a difference, so I assume the problem is an Veeam side.

My question is if anyone else uses Veeam with oVirt and gets the same or no errors?