Hi Chris are your clients just using you as a backup target i.e for a copy job? Or have you got clients who also replicate to you?
Someone from Veeam will probably best confirm this licensing/count portion as it doesn't appear to be on the documentation for the tenant entity but I believe ServerBackupCount is the number of servers protected in the tenancy, workstations is just that. If you have a couple of sample jobs knowing what is in it, i.e 3 servers, see if the 3 appears in the ServerBackupCount - sorry i can't confirm this I don't typically deal with the licensing side of Veeam (thankfully)
the VAC product documentation with similar naming certainly aligns with the above thoughts
cloudconnectBackupWorkstationCount, integer, Number of workstations protected by tenants in Veeam Cloud Connect.
cloudconnectBackupServerCount, integer, Number of servers protected by tenants in Veeam Cloud Connect.
https://helpcenter.veeam.com/docs/vac/r ... tml?ver=20