How do I change the xbox profile linked to my Halo Waypoint account? I lost my other ones email and I want to link my new xbox account.
Every Xbox and Waypoint account is linked to a Microsoft account. So you’ll need to know the username & password of the Microsoft account associated with the correct gamertag. I’m not entirely sure how to figure out what email is associated with the Microsoft account if you don’t already know 
I changed the email of my halo waypoint profile to the one that is associated to my xbox account but my linked xbox account did not change.
oh wait, i am sorry lol I guess I had to wait a little bit before it changed.
We’re all sorted here so I’m going to go ahead and lock this down 
Happy Haloing!