I made a reservation yesterday for PS with a GUC for D1, and when I made the reservation it said D1 was available. I'm looking at the flight today and it says D1 is sold out, but there's one seat showing up as unclaimed. The GUC hasn't cleared on my reservation. Should I call and see if this is my seat or since it's sold out - it's unlikely my GUC will clear?

Update - Called & for some reason the GUC wasn't showing up on their end (thanks for the tip!). I was waitlisted and this morning received confirmation that the upgrade cleared.