Huh weird, I can't access my SH3 admin page. My history shows I used 192.168.100.1 as a previous attempt but it's not working. Have tried on WiFi and Ethernet, it's in modem mode.
Nope. I can get on my Unifi admin page with 192.168.1.1. Not sure what's changed to block the SH admin page.
Most routers won't route a local IP (192.168.100.1 is correct) to WAN port without a suitable rule in place to pass it.