Can't upgrade my Killer Instinct (Xbox digital copy) to the Anniversary Edition. Please help

I purchased the Killer Instinct edition with all DLCs before the Anniversary Edition was released on my Xbox Series X. I received the upgrade for the current X|S generation, however I’m unable to update my copy to the Anniversary Edition. I’ve already tried deleting and reinstalling the game, as suggested in some forums, but without success.

What can I do to update my copy? If anyone can point me to the appropriate support channel so I can try to resolve this issue, I would really appreciate it in advance!

This has happened to quite a few people.

I’m not sure if https://forums.ultra-combo.com/u/ultrasupport/summary is still being monitored, but if so that account can help. You can try and message them.

If not you’ll have to contact Xbox support.