The old google auth plugin and the new in a M33 cannot work on the same box - different credentials API, secret, key, etc on the google end.
So in Google's Auth API (credentials), remove the old one. Remove the plugin ONLY after manipulating your mdl_user table for the M33.
Old Google plugin - in example below, k12os-xxxx.net is a google domain for email.
All users *IN THE OLD* were given a social_user_# username ... the # was sequential.
New Google part of core - using same example becomes
So username and auth columns are diff ... but you have what you need to make the changes.
Think what you have to do is directly manipulate the database mdl_user
table *IF* academic year has begun and students have already been assigned to
a course and turned in work.
Save your mdl_user table to a csv dump. Work with a copy of that .... the original is your backup and could be used again should you mess up.
Bring that into Excel
Then use Excel to get the following columns:
with username really their email address - copy the email column, paste it back in, change the column heading to username.
Keep the ID for that is the student ID number already being used..
Import users editing/updating existing.
Double check the Google API credentials ... remember, you had a call back URL with the old auth plugin. Don't need *the OLD one* any more.
'spirit of sharing', Ken