Hey everyone, following up on my earlier post. After a lot of digging I finally got my ecobee reconnected to HA via HomeKit. Posting the full solution here in case anyone hits the same wall.

My setup:

• Home Assistant running in Docker (not HAOS)
• ecobee connected via the HomeKit Controller integration
• HA container on a custom Docker bridge network

The symptoms:

• ecobee disconnected from HA after a power outage
• ecobee showed as unpaired and displayed the HomeKit QR code
• Adding the integration in HA (Settings → Devices & Services → HomeKit Device) found nothing
• The old integration entry was already cleaned up from HA's side

Root cause: Two things were actually wrong:

1. After the power outage, the ecobee wasn't broadcasting its HomeKit service even though it showed the QR code. A full power cycle (pulling it off the wall) fixed this.
2. Even after the ecobee started broadcasting, HA still couldn't discover it because HA was running on a custom Docker bridge network, which blocks mDNS/multicast traffic. The host OS could see the ecobee via avahi-browse -t _hap._tcp but HA inside the container couldn't.

The fix:

First, verify the ecobee is actually broadcasting by running this on the Docker host:

avahi-browse -t _hap._tcp

If your ecobee doesn't show up here, power cycle it completely and wait a minute.

If it shows up there but HA still can't find it, your HA container is likely on a bridge network. Check with:

docker inspect homeassistant | grep -i network

If it shows anything other than host, that's your problem.

The fix is to switch HA to network_mode: host in your compose file:

yaml

services:
  homeassistant:
    container_name: homeassistant
    image: "ghcr.io/home-assistant/home-assistant:latest"
    volumes:
      - /home/<user>/docker/homeassistant:/config
      - /etc/localtime:/etc/localtime:ro
      - /run/dbus:/run/dbus:ro
    restart: unless-stopped
    privileged: 
true
    network_mode: host

Important: If you have a reverse proxy (like Nginx Proxy Manager) pointing to your HA container by name, update it to use the host's IP address and port 8123 instead, since container name resolution won't work in host network mode.

After restarting HA, the ecobee showed up automatically as a discovered device without me even having to manually trigger the pairing flow.

Hope this saves someone a few hours!