Howard Miller

Set it to yes, change it to 1 day, set it back to no?

No.

This is what I *think* might have happened....

You created a user in the past....

username = fred, email = fred@example.com

You are now trying to update that user and the file contains

username = fred2, email = fred@example.com

I mean that the username does not MATCH the email. This is just a theory, but I can't think of anything else. Moodle uses the username to identify the existing user. It appears that it has not found the username and is trying to create a new user.

Did you read my possible explanation? Have you checked that is/is not the case?

https://moodledev.io/general/releases/3.6

When it says the PHP 7.3 is supported, you can safely assuming that 7.4 and 8.x isn't.

Same goes for database requirements. MySQL 5.7 is supported (and required); highly unlikely that MySQL 8 is going to work.

 

I hate to use the "D" word, but this is where Docker comes into its own. It's really easy (well, once you have it working at all) to run up specific versions of required software for such a venture. 

The only thing I have found that deals with repeating training is https://moodle.org/plugins/local_recompletion