Windows Server - NPS, Radius, and multiple domains

Just had a quick question and I was hoping one of you might have an
idea.  I have added a second two way trust domain (domain B) to our
forest and I need for the users in that domain to be able to VPN in
through our Watchguard firewall useing the Radius server I have
already set up and working for domainA.  I have tried adding the user
from the second domain to the existing permission group in domainA, as
well as creating a second group on domainB and adding that in the NPS
policy.  The first method gives an authentication error showing that
they used domainA for the domain instead of domainB.  The later method
prevents all users from being able to log in at all.  Any idea what I
am missing?

Did you give permission from User A to user B

--
Peter
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The way the NPS has a security group it checks in domainA.  I tried
adding the domainB user to that group but it would not autheniticate
and the logs for NPS show that it looked like the user used doaminA
instead of domainB.

s.http://www.microsoft.com/protect