How To Change 2FA On A Purchased Profile?

Bought a green profile with 2FA from someone the other day, all is fine but I'm trying to figure out how to change the 2FA to my own key. Every time I try to edit it, I'm thrown into a profile locked loop and have to input an email code and then reset the password. I just want to make sure nobody else can access this profile as my verified BM and ad account are attached.

You're gonna want to communicate with the person who hooked you up with the green profile. It'll be easier to hand down the 2FA with your own key if you've got them helping you out with that.