Happened to both me and P2 today - both of us are MVP on the same reservation (alaska metal SEA-SAT alaska award booking).
Don't see either of us on upgrade list even though we have tried checking in 3 times (contacted them to un-check us in so we can re-check in).

Not sure if its worth getting to gate earlier to put us on the list as mere mvps, but its mildly annoying.