I have 2 forests with an External Trust configured between them. Trust works perfectly for Authentication and DNS resolution. Using a MS Internal CA for RDS certs (actually seems to be working). The RDS Farm is 2 servers running 2016 w/ Gateway on RDS1. I can login and launch the appropriate applications successfully. All of that is working great. Client Local Drives and Printers map successfully.
My Problem.
I need a Home Folder (H Drive) to map to a share in the hosting domain (trusting domain). I have set Group Policy Computer config to map the H drive. I have GPO Loopback Processing enabled as well as Apply Trusted Domain GPOs.
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What am i missing? It will NOT map the H drive.