I haven't booked a BRG in a year, but I just got denied "since the rate you booked is not yet the lowest room category in IHG". They quoted this:
1. Book. Complete a valid room booking with the lowest available price (room rate) on any IHG website for any IHG branded hotel using the “Best Available Rate Search.” A “valid room booking” means a complete booking with a valid form of payment.
Is this a legitimate denial? I can clearly find a cheaper rate for the same room, but it's not the "lowest available price" on IHG. Never encountered this before.