I had an identical experience with some other networks. It was some time ago, so difficult to recall fully, but I believe restarting my phone regularly was helpful. It may just have been that patience was required for the network side changes to be propagated, but the issue was resolved after one of those restarts.
Try tinyhome https://github.com/bderenzo/tinyhome
Throw a few bits of info into a csv, run a bash script and it produces a html file like this demo page https://lab.bdro.fr/tinyhome/
This video was helpful and simple. It’s no longer any hassle. I later implemented the same using my own domain and cloudflare.
I recommend TinyHome for a straightforward homepage.
Bludit is very simple to install and configure. Worth a quick look at least.
I document my proxmox configuration, and again for each service running on it; ports, fqdn, let’s encrypt etc. Any problems or deviations from the standard installation and how I resolved it. How I mounted my media drive and and made it accessible in Plex and Jellyfin. Any configuration that I had to search for the solution, including the actual steps and not just links that might be gone in the future. The more services you accumulate the harder it is to start the documentation, so it’s a good idea to start sooner than later.
Wuphf!