Hello!
I restored into a course that had participants assigned to this via an External database. In the restore process I chose the settings 'Delete and restore into this course' and 'Overwrite Course Configuration' set to YES - this seemed the only option to restore all content into the course. When I checked enrolment methods before and after (see images below) - there no longer is an option External Database. I've tested 'Log in As' as a student to see if this authentication method would still map them to this course, yet it doesn't. Is there a way I can ensure this course is still mapped to our external databases?
BEFORE IMAGE:
AFTER IMAGE
(Note, we have also have an external holding database that maps Staff to the correct course. To test, I added further staff to this course via our external database and it still didn't work)