I have three domains, Domain A, Domain B, Domain C

I am running the powershell cmd-lets from Domain B to manage groups in domain C. This works well if I use a credential from domain C. However, I need to add users from domain A to the groups in Domain C.
Both domains B and C trust domain A (one way trust).
Whenever I try to use the add-qadgroupmember command to add an account from domain A to a group in domain C I get an error saying

Add-QADGroupMember : Cannot resolve DN for the given identity: domainA\username'

I guess this is because I am connecting to an AD server in domain C from a shell running in domain B and it needs to connect to domain A.

Does anyone have any ideas?