Adding a second public hostname to a tunnel?

I got a tunnel setup and running, I added one dockerized service and it worked, flawlessly.
Happy I added another, and ran into a wall. No matter what I add as a second public hostname it times out with no error or the browser fails. First I though it has something to do with that it was Nextcloud but it seems like it is the second and so on I add that just rigth fails.
What am I missing here? What do you need to be able to help me?

I add, for example, Nextcloud as: http
It works on LAN.
But when I click the external link it times out/fails.