@Lyndsey23 You can contact Airbnb and ask them how to proceed- you should be able to submit the ban documentation and hopefully get refunded. But also talk to your host- if you'd still want to make that trip when things open up, the host may be willing to apply whatever you aren't eligible to be refunded to a future booking. Hosts are seriously hurting right now because they have lost all their income. If you can be flexible about accepting a future stay in lieu of a full refund, that will give the host a bit to survive on, and you'll have less $ to have to come up with on a postponed trip.
Also read the info on the Airbnb site for guests regarding COVID cancellations- there are specific booking and check-in dates that are eligible to be refunded 100% and some that fall outside that.