Does anyone have recent experience with upgrading after accepting a PP buy up? I booked a K fare and was able to find a reasonably priced PP buy up offer, so I took it. My reservation now shows A as the fare class, but when I go to change my flight I’m still showing the old fare bucket for purposes of price differential.

I went ahead and requested an MUA, but curious if my standing on the list will be based on K or A. Obviously it makes a huge difference.