Solved Owncast error after reinstallation "Cloudron has no app configured for this domain"
SOLUTION: Wait. It takes a couple of minutes sometimes for everything to catch up with the changes.
You are seeing this page because the DNS record of streams.faif.uk is set to this server's IP but Cloudron has no app configured for this domain.
I needed to delete and reinstall the Owncast. I tried using the same sub-domain. I received the above error. I re-deleted the Owncast and tried installing it yet again, this time to a different sub-domain, but I received the same error again.
Perhaps I should just have waited longer after installation before trying to reach the Owncast.