Can connect to Hotspot, but playback page does not work

Hi, I configured Volumio in my local network and everything worked fine. Now I’m trying to run Volumio (on a Pi3) in my car. Hotspot fallback is enabled, and since I’m far away from my network, it sure shows the ‘Volumio’ wireless network. I can connect to it, but after this, nor http://volumio.local not load at all, and thus I cannot control volumiol. I’ve tried loading the UI with several phones. Any ideas? Thanks!

Volumio Information

Volumio Version: 2.779-2020-06-08
Hardware: Raspberry Pi 3 Model B
DAC: JustBoom DAC Hat