Access application not available

I have one zone-level access app that works and a tunnel that’s conected to it, but when I create another zone-level access app + tunnel I can’t get a tunnel the work, since when it tries to connect to the cloudflare proxy, apparently the reply doesn’t have a “cf-access-domain” header and so cloudflared fails with an “Empty app domain” error message.

Everything used to work (creating and removing zone-level access apps+tunnels), and now suddenly it stopped …