Hassio with Cloudflared

Hi.

After some time away from HA I have decided to build my hassio setup from scratch.
My first step was to configure cloudflare tunnel using cloudflared add on.
Everything works fine using http but when I go to use https I get a 403 unauthorised error.
I have watched a load of videos and read a load of how to guides and it looks like https should just work out of the box.
Do I need to configure local ssl certs etc to get the ssl connection via cloudflared to work.
I have had to rebuild my ha a number of times after trying various configs so any help would really be appreciated.
I’m not able to install other add ons when using http so would really appreciate it if I can get to the bottom of this.
Many thanks

Aaron

Darn it. I was missing the / at the end of the https url.
Another few hours I’ll never get back.