Yeah I had this happen last year when I picked up a resale W57th st. Got “free Max”, but the benefits of free reservations was only limited to the Max properties, not the legacy HGVC/bHC properties. Had to call CS several times, and after a couple of weeks finally was able to pay the difference for AI and get the free reservations. They then stripped me of my “Free Max “ “ benefits”, which came back after a week. Then they came off, then came back, and have stuck for now.
And I agree, other than a free guest certificate, I am not interested in the expanded Max properties or benefits. Out of curiosity I recently checked availability of the expanded Max properties and it was very poor for the most part. Not that I want to stay at any of them anyway.