I have the same questions
I’m trying the trial version of the WPLMS Parent Addon.
Students doesn’t see code to share with his parent under Profile > Settings: https://prnt.sc/12ihdgp
Parent see both, student and parent infos about code: https://prnt.sc/12ihh1q
When you see that (check the red arrows: https://prnt.sc/12ihirt) it seems to be a bug.
Assigning a user the parent role is manual? If the user creates his account on the platform, should he contact an administrator to assign him as a father before he can claim his child?
I think you have to extend the time of trial for me to try it.