I have a membership form using commerce. I have finally got it all working correctly except that it has now stopped creating the user.
It was creating them originally, and I have just been working on the notification form. Just got that working and then saw it was no longer creating the user.
When registering the form does send a new user notification, just doesn't create one
If none of above helps, please share link where you added registration form.
*** Please make a FULL BACKUP of your database and website.***
I would also eventually need to request temporary access (WP-Admin and FTP) to your site. Preferably to a test site where the problem has been replicated if possible in order to be of better help and check if some configurations might need to be changed.
I have set the next reply to private which means only you and I have access to it.