ERR3:7438 No NTUser.DAT file for User was found in \\server\profiles$\User. The roaming profile cannot be migrated.
Notes for myself or anyone else who runs into this specific issue:
I was running an interforest migration using ADMT 3.2. The user account migration failed with the above error, while trying to translate roaming profiles. I double checked the settings, googled and binged, but couldn’t find anything to resolve the issue. After starring at the error message, it hit me. ADMT isn’t using the FQDM to find the server that’s hosting the roaming profile. It’s using\\server instead of \\server.sorucedomain.local. I addedServer to the hosts file on the ADMT machine, and the error disappeared. I believe this is a bug.