HI
since there will be different sid for the same domain account in domain A and domain B respectively ,so I think "Migrating fsolgix VHD profile from one domain to another domain"is not suppport now.
I think ,during migration
RD session host servers which are both in domain A and in domain B all power on state,End users can do the same settings on RD session host server in domain B as the settings on RD session host server in domain A by themselves.