The Special Offer feature is one of my least favorite features with Airbnb - not because I don't wish to send Special Offers - but because of its limitations: you cannot spend a special offer if a Request for Reservation is pending which causes the dates to be blocked. i have complained to Airbnb because it is often just at this point during the negotiations with the prospective guest that one needs to the ability to send a Special Offer. I have requested many times that they change that to allow a Special Offer to be sent anytime. I'm sure their savvy high tech team of 30 years olds can sold this one,,, but they are not motivated to do so..
one must either decline the request, or accept the request or let it expire in order for Special offer feature to be availalbe. the SO feature is evidently available when only an "Inquirey" as opposed to a "Request" has been made. Go figure! Ginger near Cincinnati, Ohio.