I've read through all of the forums I could find on this subject and the conclusion is that currently you can:
- Upload a CSV or manual create an account with an email address that is already in use
- Use other types of authentication to create accounts with the same email address in use
While this feature has been red flagged as a potential security hazard and privacy issue, in a closed-off intranet or fire-walled website this would not be an issue. That is why I am asking the generous folks in the Moodle community to kindly share the code edit to disable the duplicate email check when a user is signing up for the first time using a shared email address.
Thank in advance.