With the latest find, thanks to ajmayer. I found this thread.
I tried to delete the instance to see if it would create a new folder.
Like so…
sudo -u www-data php occ config:system:delete oc1njr7k29sp
System config value oc1njr7k29sp deleted
I then re-ran
sudo -u www-data php occ files:scan-app-data
Scanning AppData for files
Path not found: /appdata_oc1njr7k29sp
So it seems it did not delete the instance and create a new one.
To add additional info.
Nextcloud is running fine and I can still sync files. I just can not log into the web UI.
My database is on an external server.