I also had the same issue and found a solution by resetting the remote. To reset the remote you need to press all four buttons for at least five seconds. As soon as the reset is successfully triggered you will see blinking LED switching between red and green. It takes about 30 seconds until the reset is done. (link).
Then I started the zigbee device discovery using ZHA from within Home Assistant and pressed the setup button beneath the battery cover on the remote’s back using a curved up paper clip. I am not sure whether I also pressed the remote’s power on/off button on the front for three seconds (and if so whether this step could be skipped). After a few seconds ZHA discovered the remote.
Next step for me is to try using some blueprints for that remote in order to make it functional. Starting point: Link
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