Originally Posted by jacobsleather

I guess this is really an Airport Authority issue, since they're the one providing the gate scanners. First time I tried apple watch BP, it was a no-go. The HKG customs entry scanners worked with it (although I think those upward facing scanners are now disabled) but the lounge and gate scanners all face downwards. There is no space for your wrist beneath the camera.

Additionally I found the BP on the phone was way, way, easier to bring up than the one on the watch.