Same here - been using a perfectly fine iPhone 6 (iOS 12.5.5) all the time and now the App is not working anaymore. I removed the App and reinstalled the App (older version) but no bookings show up on the calendar... cannot use at all.
AirBnB - an existing App that was used successfully on iPhone6 suddenly stopped working - are you aware of this or is the intention to force hosts to buy newer devices. Please advise!