Hello @Richard-And-Pauline0,
The third bullit point in the article below is about as close to it as they say. It says:
"If you don't see the option to send a Special Offer, check that the dates on your calendar aren't blocked or that you don't have any pending reservation requests for the same dates. If you have a pending request from another guest, you'll need to decline it before you can send a Special Offer."
How do I send a guest a special offer?
Whether there is only one or there are several simultaneous pending reservation requests for the dates they'll all have to be declined before a special offer can be sent for the dates.
Airbnb seems to assume that, as a guest who sends a request is ready to book at the advertised price, there isn't a need to have a special offer enticement, like there could be for a guest who just sends a non committal inquiry.
Steve.