[ninininino]

any chance you use phone for authentication and you have changed phone numbers and someone else is using your old num? or that you reuse a password with airbnb that was in a password breach/leak? could be account takeover.

[baybayblonde]

I had 2FA, with a phone number that didn't change, and I didn't receive any emails about bookings (but my email address associated to the account was not changed by a hacker), so I really don't understand what happened.

[aeturnum]

Do you use text messages for your 2FA setup? It's more work but phone-based 2FA can be circumvented without you receiving a message.