looking for help with migrating Surface Hub / MTR from onprem hybrid to Teams

Hello folks!  I've been working for the past day and a half or so trying to figure out the correct way to migrate Surface Hub / MTR accounts from SfB on prem hybrid to Teams.  I keep hitting snag after snag.  Is there a guide or end to end set of instructions somewhere on how to do this?  I've gathered from other posts online that others have the same issues, so I hope I'm not alone.

We're currently in Islands mode with full migration happening later this month.  Surface Hubs / MTRs currently exist as CsMeetingRooms on prem today, with matching users and meeting rooms online.