Hello,
a user could use one email per role. this is the limitation.
in the above screenshot, this is the new registration with new id and for instructor role.
in wplms there is nothing like to change the role from student to instructor.
you can use 2 options:
- change role manually from wp-admin >> users >> all users >> edit role.
- use a third party plugin.
you can create a new registration form who is already registered and become an instructor.
create a custom form without email and password, then you will get the request and you will know that this user wants to change the role. you can manually assign the role.