There seem to be some issues with the IKEA Bilresa. There are already quite a few forum posts about it:
Have you already completed the following steps?
- Installed the Home Assistant and Aqara Home apps on your smartphone
- Installed the Matter Server app (formerly known as the Add-on) in Home Assistant
- Is the Aqara M100 Hub set up in the Aqara Home app using the same smartphone and the same Google account?
- The Home Assistant and Aqara Home apps have all necessary permissions (Bluetooth, Location, and “Devices nearby”) enabled on your phone?
- Are you starting the pairing process inside the Aqara Home app or Home Assistant app on you Smartphone?
- In Home Assistant, go to Settings → Thread. Does the network “AqaraHome-b441” appear there? If it’s not listed, HA doesn’t have the “keys” to the network yet.