Unable to access Matterbridge UI

I’ve just installed the Matterbridge add-in on HA 2025.10. I’ve started the ad–in, but cannot access the UI on port 8283.
Amongst a long list of errors is the following:

[22:41:03.470] [PluginManager] Started plugin matterbridge-home-assistant type DynamicPlatform
[22:41:03.698] [Matterbridge] Matter server started
[22:41:03.699] [Matterbridge] The commissioning server on port 5540 for Matterbridge is not commissioned. Pair it scanning the QR code:

I tried scanning the QR code but my phone doesn’t recognise it.

Is there a part of the setup/config process that I may have missed?