TLDR: Use the official Miele app that was released a little while ago. It supports all devices and seems to have a few more features.
For anyone still having problems. We don’t use any smart Miele devices in our household anymore, and since I don’t have time to update the app anyway, the community app probably won’t get any features that make it stand out from the official app. I’ve tried fixing the non-triggering glow cards last week, but the homey SDK had a few quirks that somehow made auto-triggering flow cards not auto trigger.
It was a nice run, but supporting open source code takes a lot of time, which I sadly didn’t have.
