Why won’t Matter or HomeKit discover a device?
Discovery may require the same LAN plus multicast/mDNS, Bluetooth and correct phone permissions; guest isolation or VPN can interfere. Thread devices may also need a compatible border router.
LAN/VLAN; mDNS; Bluetooth; Thread border router; account.
Apple/Google/Amazon/device vendor.
Show the technical detail
On a managed Wi-Fi plan
Confirm network prerequisites; avoid unsupported multicast changes.
On another provider's router
Router feature support varies.
What to be careful of
Do not guarantee ecosystem interoperability.
Where this comes from: Official · see the original source ↗ · Draft—technical review · checked 17 August 2026