Remove assgined Contributor role

Hello,
I have tried this cmdlet Remove-AzureRmRoleAssignment, to remove a Contributor role from AAD group that has the delegated Contributor role in my tenant.

I got this error:

PS C:\Users\myuser\Desktop> Remove-AzureRmRoleAssignment -ObjectId xxxxxxxxxxxxxxxxxxxxxxxxxxx
-RoleDefinitionName Contributor
Remove-AzureRmRoleAssignment : Method 'get_SerializationSettings' in type
'Microsoft.Azure.Management.Internal.Resources.ResourceManagementClient' from assembly
'Microsoft.Azure.Commands.ResourceManager.Common, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'
does not have an implementation.
At line:1 char:1

• Remove-AzureRmRoleAssignment -ObjectId xxxxxxxxxxxxxxxxxxxxxxxxxxx ...
• ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
• CategoryInfo : NotSpecified: (:) [Remove-AzureRmRoleAssignment], TypeLoadException
• FullyQualifiedErrorId : System.TypeLoadException,Microsoft.Azure.Commands.Resources.RemoveAzureRoleAssignmentCom
  mand

Anyone can help me remove this assigned role, I also cannot find it at the IAM portal
On the other hand, the managing tenant has still Contributor access