@Shannon1
Came across exactly the same thing 3 nights ago, Guest wanted to book 30th December for one night and was unable too.
I got onto support and they told me the booking algorithm was seeing it as a party booking being so close to NYE and I had to realise this was for my protection.
I explained that I was comfortable with the guest, the booking was not for NYE which I had already blocked and my cottage (although listed as an entire guest suite) is a part of the main residence and I asked support if they could reach out to the guest, override the algorithm and facilitate the booking. Support said that was not possible so, I directed the guest to another site and the booking was put in place without any further drama.
Shannon, If Airbnb are going to treat us as idiots they are going to have to be prepared to pay the price!
Cheers........Rob