I would reach out to Disability Services as mamabunny suggests as something seems weird.
They could be sold out of accessible rooms. Or there could be a problem that they need to fix.
I went to the Disney UK website.
OP, I assume you are wanting to book the "Magical 2022 Package for the World's Most Magical Celebration" ?
I did a search for that package for both hotel+tickets and for hotel only, for two adults, 14 nights starting Nov 15 2022.
For hotel-only, 13 hotels match with availability, including Coronado Springs.
This is what I got when I did the same search but flagged I needed an accessible room, whether for 2, 7, or 14 nights:
So clearly a problem with the accessible rooms, either they can't be booked online for some reason, or there is a glitch making them not available, or they are sold out already.
Either way, call and speak to a Disney human to find out what is going on.
SW