I have this issue, my motion sensor stopped working and when I tried to re-add it that didn’t work. Unfortunately restarting Homey didn’t solve it. I have the same issue with one of my Ikea Tradfri remotes.
I have the same problem… can’t add hue motion sensor! If it find it it say took to long time got no answers from sensor. Maybe tried 20 times about 1,5 hour but no luck.
Often you have to push the pair button every other 2s to keep the sensor “awake” during the pairing process.
Thx for answer! Do you know what the other button with letter T Are? Side of setup button?
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YW! No, I’m sorry I don’t have the device myself. The ‘keep-awake’ hint works in general 
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To push setup button didn’t work at all… don’t find the sensor…it is something wrong with this Philips app! It will find it in the Philips hue bridge app… But I will have it without bridge🙄
Here it’s the same terrible since the last Firmware Update. I can’t even use the button to authorize third party apps like Alexa.
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I did asked thuis question earlyer and the answer was.
“From what I understand it’s a transmission test button.”
But hoe it works he didn’t know.
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Hi Johan, any update on the 3 spot?
Thanks!
Hi, i’'m still stuck with this one
would you have any suggestion here?
Regarding the sensitivity adjustment, there is an old request on GitHub, but the status is still open. Currently there is no possibility to adjust the sensitivity via device settings.
If the outdoor sensor is connected via the Hue Bridge the sensitivity is adjustable.
Please note that the Hue Bridge builds its own Zigbee network and therefore may need some repeaters (lamps, plugs) to ensure an good connection stability and range.
Another point is that the 2.4 GHz frequency of the Wifi, Homey and Hue Bridge must not interfere with each other.
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Hi.
Since yesterday, all my hue devices added directly to homey using the app, have stopped responding. Anyone else experiencing the same?
I have filed an issue on it, but hav not gotten a response yet.
//Christian
Only Hue or other zigbee devices too?
All zigbee devices. Didnt realize that until now! I have restarted homey in the meantime, but it did not solve the problem. Any suggestions?
Try this solution, Christian
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If that does not work, at least for me it didn’t last week, Please check you Wifi protocol of your router, mine was upgraded by my provider to 802.11ax (Wi-Fi6) which did not gave any errors on Homey but after a while obviously the Zigbee chip started tripping and made all my Zigbee devices unreachable. Verify if your’s is on 802.11b, 802.11g, 802.11n (Wi-Fi 4) too.
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It worked doing the recovery, so thank you very much! I have also changed the standard power adapter just in case.
//Christian
Oops… Sorry Jordi, I’ll put some effort into it.
Well, I have this working randomly in the lab… since I have to work outside Athoms framework I have built a few Hue specific clusters and adress the Hue specific functions using these. Problem is that the sensors run on battery and such devices does not always talk with the controller… so when I want to change a setting it does not always trigger. There are ways to handle this so I will eventually have it working… when I have time to prioritize this feature 
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Yesterday I tried to add a new bought Hue smart plug / socket. It connected as an unknow zigbee device. After removal, restarting Homey, resetting the device, the same happened again. It is working like that, but maybe something went wrong, or did Philips change the smart plug?
Zigbee device shows:
Signify Netherlands B.V.
LOM007
