Have you already installed the Zigbee Map app ?
Do the following :
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pair the RTCGQ11LM very close to the hub. Make sure it works. You may need to pair it 2-3-4-5 .. times, Ensure it changes motion active/inactive reliably.
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Check the Zigbee Map - you will probably see the motion sensor paired directly to your hub. This is the problem - Aqara older generations battery-powered devices must be paired via an compatible Zigbee repeater (router)
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Without deleting the sensor, pair it again, but this time very close to a mains-powered Zigbee repeater (router). By 'close' I mean nearly touching the repeater, so that its signal is so strong, that the Aqara sensor does not hear anything else, except that repeater.
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Refresh the Zigbee Map. You must see a picture like this - the Aqara sensor is now communicating via your repeater of choice :
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If the map still shows a direct connection to the hub - pair it again very close to the hub (step 3).
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Verify that the sensor still works.