[steelframe]

> It's more about some weird incompatibility between my device and the scanner.

I think I held up an entire flight for nearly an hour because the QR code on my Graphene OS Android phone scanned fine at the TSA checkpoint but didn't scan at all at the gate. They ended up letting me on the flight without properly registering that I boarded in their system. That triggered some crazy security hold that prevented the crew from obtaining permission to pull back from the gate.

[kiwijamo]

When that happens (and note it happens to paper boarding passes as well) I've always seen gate agents simply type in the details off the boarding pass. E.g. name, sequence number, etc and do a manual entry that way. I've had this happen to me at least once, and the agent very quickly just typed in something in their terminal and it was all done with no fuss. Really surprised no one thought of doing this in your situation.