I updated one of my Ikea 5 Button Switch and one of my Ikea Dimmer (On-Off) to the newest firmware (24.4.5 / 24.4.6). After that the group bindings dont work anymore. The Light Group is created:
Got a response from @ebaauw on the initial request:
See the latest DDFs. I think the old (round) wireless dimmer is the only IKEA controller that still sends group casts (probably because its firmware hasn’t been updated recently). The others accept the binding allright, but don’t send group casts. They should not expose config.group. and no associated group should be created on pairing, but it could be that the legacy code interferes. Not sure about existing resources, you probably need to remove and re-pair the device.
The binding functionallity of this remote varies per firmware version:
below 2.3.075: suppports binding to groups only. It can only be bound to 1 group at a time. By default this remote is bound to the default bind group which you first have to unbind it from. This can be done by sending to zigbee2mqtt/bridge/request/device/unbind payload {“from”: “DEVICE_FRIENDLY_NAME”, “to”: “default_bind_group”}. Wake up the device right before sending the commands by pressing a button on it.
2.3.075 and greater: supports binding to devices only