I have upgraded my Airbnb application to the latest version (20.35) on my IPhone 8 and since then I can no longer login.
I have the latest OS.
I get a message saying:
”For security, Airbnb limits how often you can login”.
I look after several accounts and I get the same message for all of them.
Call them several times until they do something to really help you. I had to call them and get really unpleasant before they sorted it out. A real nightmare! Good luck!