RHEV: Can't attach user to a vm with Powershell API

Issue

• Cannot attach user to RHEV VM using Powershel API.
• Can successfully do the same using Admin Portal.
• Powershell error:

PS C:\scripts> select-User -SearchText "myUser" -AD
      UserId     : 0223a732-a7ad-46f6-b895-0d68a1a92d45
      Department :
      Domain     : ADDOMAIN
      ...
PS C:\scripts> Add-User -UserId 0223a732-a7ad-46f6-b895-0d68a1a92d45 -UserRoleId 00000000-0000-0000-0001-000000000001
      Add-User : Cannot find user with id 0223a732-a7ad-46f6-b895-0d68a1a92d45
      At line:1 char:9
      + Add-User <<<<  -UserId 0223a732-a7ad-46f6-b895-0d68a1a92d45 -UserRoleId 00000000-0000-0000-0001-000000000001 -Domain ADDOMAIN
          + CategoryInfo          : InvalidArgument: (:) [Add-User], ArgumentExcepti
              on
           + FullyQualifiedErrorId : UnableToAddUser,RhevmCmd.PSCmdlet_Add_User