2000 Trust domain does not appear

Can’t See Trusted Domain in List to add to local group?

I have two domains seperated by the Internet and a firewall/VPN device.

The two networks are in routed mode and we can share files, use printers on both networks but, only if logged in as a user on the other network.

I setup trusts and they have been verified. I have secondary DNS pointed at each other DomainWEST and DomainEAST.

When I go to add DomainWEST’s users to a group in DomainEAST the WEST domain does not appear in the dropdown.

Any ideas would be much appreciated.

THANKS.