So I noticed that even if you are in a high rank on the battlepass. New rewards that were added on the track that weren’t there in the previous flight don’t retroactively unlock. Also new armor customization that’s on the track that the battlepass rank has yet to reach can be used once it’s unlocked.
If you are encountering issues during the flight, please refer to the known issues list on https://aka.ms/HaloSupportInsider and submit tickets for issues not present.