If Airbnb cancelled a confirmed booking it's normally because there is an issue with your payment method, or your profile has been flagged for some reason.
Hello @Denise1745, as mentioned by our amazing Host Helen, could you share if the Host mentioned anything in advance? Did you have the opportunity to reach out to the Support Team? Here is the link where you can contact them in case you find it useful: https://www.airbnb.ca/help?audience=guest