Happens on one profile for me as well, I had to clear the app storage and restore the settings from a previous backup.
Restoring from the backup file with hide_username
set to false
did let me in using that backup.
Device information
Sync version: v23.11.29-22:27
Sync flavor: googlePlay
Ultra user: false
View type: Slides
Push enabled: false
Device: cheetah
Model: Google Pixel 7 Pro
Android: 14