I opened an issue on GIthub but not getting any feedback so thought I would try a wider audience here.
I have a set up that works perfectly in Chrome browser (Windows) in both the panel and card view. Note: I had to put the dummy binary sensor in a group to get it to show up as per other threads on github.
However, on my android phone (in both chrome and firefox), whilst the panel floorplan works fine, the card view just displays the group name (Downstairs) and when you click on it you get a toggle switch to turn the group on which does nothing.
I have noted an error “Unable to find service binary_sensor/turn_on” but can’t figure out how to resolve it and suspect that is the cause.
Any ideas about the above or where else to start looking?