UserPrincipalName extract mail prefix

Hi, thanks for your feedback! As it happens I have a similar case myself, so I am doing some changes that I aim to release in a new alpha shortly.

There are 2 relevant changes upcoming:

• Instead of hard coding username to be UPN, you will get a choice between UPN or email.
• I will add en event you can subscribe to, where you can alter the data you save on the user before saving it. If the first change is not sufficient, you are able to do your logic in that. I will make a documentation page for it.

I've released alpha4 that includes this event + added documentation here: https://www.drupal.org/docs/extending-drupal/contributed-modules/contrib... → (with your use case as example code)

Marking as fixed as this can now be handled via a custom event subscriber.

Automatically closed - issue fixed for 2 weeks with no activity.