@tweedledope The static setup code can typically only be used once after each factory reset. You can generate a new temporary one by pressing "share device" or similar in the Matter controller that the device has already been added to.

@Emil Here's a repo if you'd like to check it out. There's a built set of assets in the Release section.
https://github.com/overcastlabs/flic-wiim-control

And this is the code I'm using in FlicHub studio to handle the matter events for volume-up, volume-down, volume-set, toggle operations and preset handling.

FlicHub Studio - QuickJS code in Google Drive