Set-RMADCollection : Failed to save the schedule. No mapping between account names and security IDs was done. Powershell Error.

I'm having this error with our production servers with win srv 2016 OS. But this also works on our lab server with same OS.

PS C:\WINDOWS\system32> $Schedule_Cred = Get-Credential

Set-RMADCollection –InputObject $Get_Collection –AgentCredential $Agent_Cred -AgentCredentialEnabled $true -Schedule $Schedule -ScheduleCredential $Schedule_Cred
cmdlet Get-Credential at command pipeline position 1
Supply values for the following parameters:

Set-RMADCollection : Failed to save the schedule.
No mapping between account names and security IDs was done.
At line:3 char:1
+ Set-RMADCollection –InputObject $Get_Collection –AgentCredential $Age ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [Set-RMADCollection], COMException
+ FullyQualifiedErrorId : System.Runtime.InteropServices.COMException,QuestSoftware.RecoveryManager.AD.PowerShell.Cmdlets.SetCollectionCmdlet