Hey! We’ll fix why HomeKit is not discovering devices and get your accessories showing up in the Home app again (not just “reboot and pray”). Quick questions so we target the real cause:

• What accessory type/brand is missing (smart plug, light switch, thermostat, camera, door lock, garage opener)? Is it HomeKit-only or Matter / Thread-based?
• What iPhone/iPad model and iOS version? Any HomePod mini or Apple TV 4K acting as a Home hub?
• What’s the exact message: “Accessory Not Found”, “Unable to Add Accessory”, “Connecting…”, or device pairs but then shows “No Response”?
• Network setup: single router or mesh (eero/Orbi/Deco/UniFi)? Any Guest Wi-Fi, AP/client isolation, VLANs, or “IoT network” enabled?

Once I know that, I’ll walk you through a step-by-step HomeKit pairing and Home app discovery fix.

Perfect details — this is a very common pattern: HomeKit not discovering devices during setup even though the phone and Wi-Fi “seem fine.” Usually it’s one of these:

• Network discovery is blocked (HomeKit relies on mDNS/Bonjour for local discovery). If guest network, “IoT VLAN,” AP isolation, or multicast filtering is on, the Home app can’t find the accessory.
• 2.4 GHz setup mismatch: many Wi-Fi HomeKit accessories are 2.4 GHz only. If your iPhone is on 5 GHz (or band steering is aggressive), pairing can fail with “Accessory Not Found.”
• Stuck Home app / iCloud state (home hub not fully synced, wrong Apple ID, old Home configuration, or hub needs a restart).
• For Matter/Thread: the hub is required (HomePod mini / Apple TV 4K) and must be healthy, updated, and on the same Apple ID/Home.

We’ll fix it in a clean order: 1) confirm hub & iCloud → 2) confirm Wi-Fi & subnet → 3) unblock Bonjour/mDNS → 4) reset and re-add the accessory.

Great — let’s start with the fastest “no-risk” checks that often unlock discovery immediately.

Step 1 — Confirm Home hub + Apple ID basics (HomeKit discovery depends on this)
1) On your iPhone: Settings → your name → iCloud → make sure Home is ON.
2) Open Home app → … (More) → Home Settings → Home Hubs & Bridges → confirm your HomePod mini shows as Connected (not “Standby” forever, not “Updating”).
3) Reboot the HomePod mini (unplug 20 seconds → plug back in). This helps when HomeKit pairing gets stuck.
4) Make sure iPhone and HomePod are on the same Apple ID for this home. A mismatched Apple ID can cause “HomeKit accessory not found” during setup even if Wi-Fi is fine.

When that’s confirmed, we move to the network side where the Deco “IoT network” toggle can block discovery.

Perfect — now we do the most common setup blocker: the accessory uses Bluetooth LE for initial handshake + then switches to Wi-Fi. If Bluetooth/Wi-Fi band alignment is off, HomeKit discovery fails.

Step 2 — Make pairing conditions “ideal” (this alone fixes tons of HomeKit not discovering devices cases)
1) Turn Bluetooth ON on the iPhone (HomeKit often needs it for setup).
2) Stand within 1–2 meters (3–6 ft) of the accessory. Avoid pairing through a wall or far away — the “Accessory Not Found” message can be simply weak BLE signal.
3) In your mesh app, temporarily force your phone onto 2.4 GHz (or split bands if your system allows). Many HomeKit Wi-Fi accessories are 2.4 GHz only, and pairing can fail if the phone stays on 5 GHz during setup.
4) Disable VPN / iCloud Private Relay temporarily (just for setup). Some network privacy features can interfere with local discovery and “add accessory” flows.

After that, try Add Accessory again. If it still can’t discover, the next step is your Deco’s “IoT network”/isolation settings and mDNS/Bonjour multicast.

Yep — this is where most mesh systems break HomeKit setup: the accessory and the iPhone are on Wi-Fi, but they can’t “see” each other because discovery traffic is filtered.

Step 3 — Unblock HomeKit discovery (mDNS/Bonjour + same subnet)
In the Deco app (wording varies), look for and temporarily disable these during setup:
• Guest Network for the accessory (do NOT connect the accessory to Guest). Guest networks often block “LAN access.”
• IoT Network or “Device Isolation.” Some “IoT” modes isolate smart devices from phones for security — which prevents Home app discovering accessories.
• AP Isolation / Client Isolation / “Block local network.” If enabled, HomeKit pairing can fail with “Accessory Not Found.”

Then confirm these are ON (or not restricted):
• Multicast / mDNS / Bonjour support (HomeKit discovery relies on it). Some systems have a toggle like “Enable multicast enhancement / IGMP snooping / mDNS” — if there’s a specific “mDNS” option, enable it for the main LAN.
• Make sure phone + accessory are on the same SSID and same subnet (not different VLANs). Even if the Wi-Fi name looks the same, some meshes segment clients.

After saving, reboot the main Deco node (or entire mesh) once. Then try adding the accessory again while your phone stays on the main 2.4 GHz network.

That’s actually progress: discovery is working, but the accessory is either “half paired” (a ghost entry) or it can’t hold the Wi-Fi credentials reliably.

Step 4 — Clean up failed pairings (“ghost” accessories) and re-add properly
1) In Home app, look for the accessory tile (even if “No Response”). Long-press → Accessory Settings → scroll → Remove Accessory (if it won’t remove, sometimes you must remove it in the manufacturer app first).
2) Factory reset the plug/switch using the manufacturer’s reset method (usually hold the button 5–10 seconds until LED flashes). This clears the old HomeKit pairing keys and Wi-Fi profile.
3) Reboot your iPhone (quick, but it clears stuck BLE/Wi-Fi states that cause “HomeKit unable to add accessory”).
4) Try adding again: Home app → Add Accessory → scan code, and stay on the same 2.4 GHz SSID for the whole process.

If it flips to “No Response” right after adding, we’ll check your router’s DHCP and security settings next (WPA2 vs WPA3, private Wi-Fi address, and IP leases).

Good callout — Matter/Thread pairing is a slightly different workflow than classic Wi-Fi HomeKit accessories, and discovery depends heavily on the hub being “healthy.”

Step 5 — Fix “HomeKit not discovering Matter/Thread devices”
1) Make sure your Apple TV 4K and HomePod mini are updated (tvOS/HomePod software). A mismatch can break Matter commissioning.
2) In Home app → Home Settings → Home Hubs & Bridges: confirm at least one hub shows Connected and is set as the active hub (sometimes switching hubs helps).
3) Power-cycle the active hub (unplug 20 seconds). Thread border router functions can get “stuck” until rebooted.
4) Keep the Matter bulb very close to the hub for first pairing. Some devices use BLE to start commissioning, then move to Thread.
5) If it was previously paired to another ecosystem (Google/Alexa), do a full manufacturer reset so the Matter device is “uncommissioned.” Otherwise it won’t appear and HomeKit will say it can’t connect.

If the bulb still won’t show, your mesh may be filtering the local setup handshake. We can also check if the phone is switching nodes/roaming mid-setup (a common reason Matter devices disappear).

Absolutely — the goal is stable Apple Home, not constant “remove and re-add.” Here’s how to prevent HomeKit devices not responding and reduce “No Response” after updates.

Step 6 — Make HomeKit discovery + reliability stable (best-practice router & Home settings)
• Keep smart accessories on your main LAN (not Guest). If you use an “IoT network,” make sure it still allows mDNS/Bonjour between your iPhone and accessories (or has “allow local access” enabled).
• Avoid strict client isolation, and don’t block multicast if your Home app relies on it. HomeKit discovery uses local network announcements; blocking them causes “HomeKit not discovering devices” and “No Response.”
• Wi-Fi security: for older accessories, WPA2-Personal (AES) is often the most compatible. Some older cameras and plugs break on WPA3-only networks.
• If your mesh has “Fast Roaming / 802.11r” or aggressive band steering, try disabling it if HomeKit accessories drop or setup fails mid-way.
• For flaky “No Response” devices: set a DHCP reservation so the camera keeps the same IP, and ensure it has strong 2.4 GHz signal (poor RSSI = random dropouts).

If you tell me your exact Deco model + camera brand, I can point to the specific toggles (they’re often hidden under “Advanced”).

Summary: If HomeKit is not discovering devices, first confirm your Home hub is connected and iCloud Home is enabled. Then make setup ideal (Bluetooth on, close distance, phone on 2.4 GHz for Wi-Fi accessories). Next, disable guest/IoT isolation and allow mDNS/Bonjour so the Home app can find the accessory. Finally, remove “ghost” entries, factory reset the device, and re-add it cleanly. If you want, open the chat and I’ll guide you through the exact router toggles for your mesh system.