I’ve also made a post on the Inovelli subreddit, so apologies if I’m duplicating efforts here.
I’ve just got a couple of Inovelli Blue switches in. I installed one and I’ve got it in Smart Bulb Mode. I created a group with two Zigbee bulbs in it, and then I bound the switch to the group. The switch is unable to toggle the lights!
I removed the group binding and instead bound the switch to the two bulbs separately, and the switch is indeed able to toggle the bulbs this way. This includes dimming features.
I’d prefer to bind the switch to the group and have this work, but it doesn’t seem I’m able to. I’ve followed the exact steps at the Zigbee2MQTT Group Binding video which should match my description here.