I had a similar experience with my upgrade on QF72.
4 of us travelling in total, 3x on 1 booking direct with QF, myself on my own separate booking made thru Amex Travel.
Upgrade requests were sent from a P1 account, the booking with my 3 companions was upgraded at T-72, nothing for me. P1 told me not to check in until we get to the airport just in case.
Right up until we went to drop bags, it seemed like I'd be travelling solo in Y while everyone else got upgraded, then when I printed my bag tag, J bag tags came out and my boarding pass said I was in J, seat 2F.
I never got an upgrade confirmation text and the Qantas app said I was in my economy seat until after we landed, however the physical boarding pass had me in J and there was no issues on the flight when I sat in 2F.
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This is only true if the upgrade request comes from a Platinum One account.
