@Caroline271 I see that you may have two issues: Was there a glitch in the Air BNB system that did not support your settings? Can you cancel this IB reservation without penalty? Please contact Air BNB Customer service ASAP. Hopefully you have your communication with the traveler so it supports your attempt to work with the guest.
The phone number to reach Air BNB is 855-424-7262. A complete guide for the various ways to reach Air BNB is locate on this site. Keep it for future. Usually I use the Twitter, but in this case, speaking with a representative is needed. Good luck and keep us posted as to what happens.