Cannot connect to Collabora server

Changing that to http gives the same timeout error

Doing that just makes it get stuck at “saving” when I click apply

Same error from before when doing that.

That URL should be just https://mydomain.com per this part of my docker-compose.yml:

letsencrypt:
    image: linuxserver/letsencrypt
    container_name: letsencrypt
    cap_add:
      - NET_ADMIN
    environment:
      - PUID=1001
      - PGID=1001
      - TZ=Country/City
      - URL=mydomain.com
      - SUBDOMAINS=wildcard
      - VALIDATION=dns
      - DNSPLUGIN=cloudflare
    volumes:
      - /opt/docker/config/letsencrypt:/config
    ports:
      - 443:443
      - 80:80 
    restart: unless-stopped

but setting it to that also gives the same error.

I was following this post.