Hi Carl,
We are always happy to have more hands.
I suspect that you are looking at one of the more recent regions. It looks like it hasn't been enabled in the account and that will be the change needed. Until then, you shouldn't have difficulty finding and using the Fedora images published in the AWS Marketplace.
https://aws.amazon.com/marketplace/pp/prodview-doqa62vonqvo6
Also, the snapshots have copy permissions, so you can copy the image into your own account to any region you would like.