If you have already a domain controller on windows 2019 , that means that you don't need to migrate from to DFSR for sysvol replication , because Windows 2019 cannot be promoted as domain controller in a domain with FRS replication for sysvol folder.
That's why The result of DFSRMIG.EXE /GETMIGRATIONSTATE is eliminated and the folder was not moved because we can't have FRS on windows 2019
Nothing to do in your side :)
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