The issue has been solved on Airbnb side. The root cause of this issue was a change on the code from Airbnb to their authorization logic.
Airbnb has put in place a fix and you are now able to connect and import new Airbnb accounts.
Airbnb has added a new screen to the process which indicates that a new account has been created. This is not the case. No new account is created but the message is confusing. We have escalated this with Airbnb.
Please email email@example.com if you continue experiencing issues or if you have any questions or feedback.