Add-MSContactsToModuleItem
Add an existing Contact to an App,User,Device etc
Syntax
Add-MSContactsToModuleItem -Module (String) -InstanceId (Int32) -ContactId (Int32) -ContactTypeId (Int32)
Add-MSContactsToModuleItem -Module (String) -InstanceId (Int32) -ContactId (Int32) -ContactTypeName (String)