Issue with Leveling Up EVRY JOB After Using Ninja Job Booster

Problem Summary: I am unable to level up my Ninja past 90 after buying the Job Boost, even with the Dawntrail expansion, and the level bar is red with a crossed-out symbol with every Job.

I purchased the Job Boost for the Ninja. My account has the Dawntrail Expansion and all previous expansions, as well as active game time. I used the item and the gear chest, and my Ninja is level 90, but I am stuck at this level. The level bar at the bottom of my screen is red with a crossed-out symbol, indicating I cannot level up further, despite having the Dawntrail expansion. I am unsure if this is a bug, intended behavior, or if I need to do something else. I read several forums but found no mention of this issue, so I assume it's a bug. Could you resolve this?

UPDATE:
I cannot level up with ANY job anymore, no matter which one I switch to. The level bar at the bottom is red and blocked for all of them. Why is this happening after I used the Job Boost?

Are you by any chance playing on many platforms like PC and PS5? Which platform did you buy Dawntrail for?

Did you put in the standard key for Dawntrail, not just the pre-order key?

Good morning! Thank you for posting in the Final Fantasy XIV Technical Support Forums.

Unfortunately, the issue you are describing is something we are not able to assist with in the Technical Support Forums. As account in question is European in region, we advise to contact the continuing your correspondence with the European Support Center.

This thread will be moved to the 'Separate Support Required’ subforum as contact with the Square Enix Support Center is necessary to resolve the issue. Thank you once again for visiting the Final Fantasy XIV Technical Support Forums!