Mini Media Player not working in companion app

Hi,
I just added Sonos speaker and Mini Media Player to my HA.
It works perfectly from desktop/web interface, but the same dashboard that works on PC with web browser shows this error on Android companion app:

Any clues why?

If that matters, here’s the card configuration, fairly simple:

    cards:
      - type: custom:mini-media-player
        entity: media_player.living_room
        group: false
        volume_stateless: true
        toggle_power: false
        artwork: material
        shortcuts:
          columns: 3
          buttons:
            - name: Free FM Rock
              type: music
              id: x-rincon-mp3radio://https://freefmrock.radioca.st/stream
            - name: AntyRadio
              type: music
              id: x-rincon-mp3radio://https://an03.cdn.eurozet.pl/ANTGRE.mp3
            - name: Radio 357
              type: music
              id: x-rincon-mp3radio://https://stream.rcs.revma.com/ye5kghkgcm0uv
        source: full
        info: scroll

do you see the same issue using chrome for android on the same device? is android system webview upto date?

Yes, same problem when going to the dashboard from chrome and from firefox on my android device.

What does it mean exactly “is android system webview upto date”?
I have all the available updates installed on my device… Anything I should install or setup manually?

Just found something interesting.
From my PC I connect to HA over local network address ( http://192.168.0.xxx )

From my Android device I have connection configured over Cloudflared tunnel.
When connected to HA from PC over the tunnel, I saw the same error on the PC.

Connecting from Android to local address doesn’t solve the problem, though.

its an app on your phone that updates via the play store, its like keeping the browser up to date.

since you can reproduce on the browser in the same device you need to check with the custom card author to see if they can help you out.

Ok, solved the problem following the steps here:

and here (UI mode) - added duplicate mini media player entry in my HA

Now it works everywhere.

Looks like the installation through HACS is not working perfectly.
I’ve filled another issue on github for this.