Originally Posted by
VickiSoCal
What happens if I'm not at the gate at T-40, I see the check mark by my name, download the boarding pass and the gate agent calls my name and I don't come and never check the app again until I board?
You board and take your first class seat. The difference with the OP is that he was never upgraded as the agent wanted to verify splitting the party. I'm sure there are hundreds of upgrades daily that go to mobile BPs and never interact with an agent until boardng.