It is within 48 hours of booking, but at least 14 days before check-in, @Olivier774 .
Is the reservation set to start within the next two weeks? If so, that's the problem.
There is nothing you can do in that case. You agreed to the policy when you booked.
You can ask your host if they will consider a refund if they are able to book the dates to someone else after you cancel. They don't have to, but that is something that is possible for some hosts. Not all, of course, and that is why hosts choose certain policies. We choose what works for our hosting situations.
If your reservation is within the 48 hours but more than two weeks out, you can give Customer Service a call to see what's up.
All the best!