Sharepoint Powershell to add a user from a trusted domain to sharepoint

Our sharepoint farm was in Domain A and we wanted to grant rights to a group in Domain B.
It worked fine from the GUI but powershell add-spuser or new-spuser failed – both stating the user ID we were adding was no good.
Specifically this was for Mysites – we had thousands of them so doing it by hand wasn’t an option.

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