We have a trust between two domains in our environment, but the user profile sync is configured with the main domain only.  As there is a “Full Trust” between all domains, we are able to add users to SharePoint objects, but when we try to add a user in a Nintex Form it throws an exception -- not resolving user from other domains.

Has anyone raised and resolved this issue before?  Any suggestions would be much appreciated.

Thank you 

Martin