Migration aftermath - why can't I log in?

Automatic recover from Time Machine or Migration Assistant are two things I never recommend.

I always tell people to make a clean install, setup as a new Mac, install latest version of favorite apps, and for a backup, go to Sys Prefs > Sharing and rename the computer to the same name of previous install or old computer used (this name is the same of the .backupbundle file), then activate TM in Sys Prefs and select the same drive used as TM. This allows macOS to identify the old TM and you can open it in that particular TM way with the timeline of backups on the right, and then manually copy all data in steps, controlling the process and making sure all files are back and still working, avoiding bringing old configs and broken files and apps back to your fresh install.

I know, those features are here just for the job, but I learned hard way is the best way in this situation.