I have a upcoming points stay this week where when I booked, it did not mention an amenity fee (booked it last year). When I was looking at the booking in the app, it indicated the amenity fee, but I don't ever recall it, nor do I see it mentioned in the booking email.

Is this something hotels will actually charge if the fee was added since booking? I would imagine they have to honor what it was at booking. Curious if anyone has been in this situation.