@BobKersten this is an issue I am currently looking into… not sure if it is Homey or EcoDim related.
@HansK not working with the Tradfri bridge primarily.
Offcourse it doesn’t make sense to hard-wire the EcoDim dimmer to any Zigbee bulbs. Creating Zigbee groups and scenes, to create a “soft-link” is something that is not supported yet within Homey; but this is again generic, not Tradfri related.