Unable to modify User Profile Disks in RDS Session Collection

[Numerus Limited]

When I try to make a change to the user profile disks section in the RDS Farm Collection Properties I get an error stating the following;RDSH Collection Property User Profile Disk update on collection RDS 2022 FARM failed on server Could not create the template VHD. Error Message: No mapping between account names and security IDs was done. .It triggers an EventID of 24580 but I can't work out why it is failing, please help!

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