Using this URL, the front end works from Chrome browser on my Windows 10 computer (running on an iMac), but doesn’t work from Chrome on my Android phone. Any ideas why? I have also tried using the ip address of my Raspberry Pi which is running hassio. No dice.
The .local domain isn’t actually DNS but mDNS, which is related to Bonjour and not well supported in Android. Depending on your router"s DNS implementation you may be able to use something like http://hassio.lan:8123 instead.