So I played the free to play version of Killer Instinct then bought the supreme edition shortly after. I switched computers to a new/better one and I logged into killer instinct and have lost my KI Gold, Player progression, And my character progressions. I talked with xbox support but they just told me I should make a thread here.
Okay quick question: you’re using the same account as on your old computer, right?
If not it may be a simple case of mistaken identity.
Unfortunately I have my doubts about that and it looks like one of the most annoying in the history of KI might be trying to make a comeback… 
Make sure you report this in the Official Bug Reporting Thread ASAP so the devs can see
Its the same account im pretty sure and ill put this on that thread thanks for the help!