Here's a couple of things you can try:
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Pair the device really close (5cm / 2in) to the hub; give it a couple of tries if it does not work. We want to make sure the remote talks directly to the hub, not via a close-by repeater.
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Update the device firmware as old versions do not register button clicks. Follow closely the steps from here, just clicking the "Update firmware" button does not always work with battery powered devices: [GUIDE] IKEA Firmware Updates
Hope this helps!
