Please provide us more information on the issue:
1. Is the Edge Inspect Chrome extension icon still grey?
2. Automatic Discovery doesn't work across different Subnets. Edge Inspect uses Bonjour (Zeroconf) to enable device clients to discover desktops to connect to. Bonjour doesn't broadcast across subnets so wireless devices will not be able to automatically discover computers running Edge Inspect on a different subnet. You should still be able to use Edge Inspect, but you will have to manually connect the device to the desktop by clicking the + (plus) button in the upper right corner of the device client Connections list.
3. Make sure port 7682 is open and not being blocked by any firewall.