Register-ScheduledTask : The user name or password is incorrect.
At line:4 char:1
+ Register-ScheduledTask myAdminTask –Action $action –Trigger $trigger  ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : AuthenticationError: (PS_ScheduledTask:Root/Microsoft/...S_ScheduledTask) [Register-ScheduledTask], CimException
    + FullyQualifiedErrorId : HRESULT 0x8007052e,Register-ScheduledTask

$action = New-ScheduledTaskAction  "C:UsersadminDesktopbackup.cmd"
$trigger = New-ScheduledTaskTrigger -At 23:00 -Daily
$principal = New-ScheduledTaskPrincipal -UserID abcgmsa$ -LogonType Password
Register-ScheduledTask myAdminTask –Action $action –Trigger $trigger –Principal $principal