What time period are you trying to rent? Wyndham has introduced owner priority dates where rentals are largely blacked out. If you are trying to rent during one of those times that is likely why.
Wyndham is also, once again, cracking down on commercial renting operations, including cancelling reservations, which is driving down rental inventory generally.
Extra Holidays is part of Wyndham. There is a generous cancellation policy. We owned a contract at WBC we got for about $200 but ended up getting rid of as booking is cumbersome. We rented our points through Holidays one year and communication was terrible. Our first renter backed out and Wyndham didn't let us know. They booked another renter who also backed out at the 11th hour, causing us to lose points. They suck for owners, but are generous to renters!