I’m having the same issue…Was just on with Xbox support for 90 minutes, for reference & performed the following:
-Confirmed Premium Deluxe license
-Deleted saved & world data / DLC partition
-Deleted local gamer profile & Xbox and re-authenticated console
-Signed in / out of profile in Flight Sim
Still shows Premium upgrade as owned bundle, but not Premium Deluxe in the Flight Sim marketplace; exhausted options with Xbox support. I’ve also tried uninstalling and re-installing the 100gb base game, and the same issues persist.
Zendesk ID# 111790