I’ve had Hue indoor and outdoor motion sensors for years now and they have always been the least reliable of the 80+ Zigbee devices on my C-5 hub. They annoyed me enough that I finally put them back on the hue bridge a month or so ago. I would generally only have problems with them after a firmware update, or if I shut down the hub for some reason, but the outdoor sensors are a real pain in the butt to reset, and the only devices I’ve had to do this, with, in recent memory. I had a lot of trouble with the hue dimmer switches not staying connected, and removed all of them a couple years ago, placing them back on the hue bridge.
I’m starting to wonder if the c-8 is just exposing some weakness of hue devices, or if it is just a Hubitat zigbee bug that has been there and not brought to light due to the previous hub’s weak radio and heavier reliance on repeaters to communicate with devices.
With that in mind, you might try decreasing the power of the Zigbee radio to 8 or 12 to see if that fixes your problem. others have posted improved results with power level set to 8, which was the maximum power of the previous hub’s zigbee radio. I actually turned mine up to 20 and saw better results, I think it really depends on your environment
Possibly. Except that Hue devices are not the only ones exhibiting issues. I'm having similar problems with INNR plugs and others have reported a variety of devices. I have had Hue outdoor sensors for months, never had an issue on the C7. And I am running on power setting 8, after having tried 16 as well.
Thank you for the suggestion I will give it try but most all of zigbee devices are having issues Aqara too! It something with the c8 the c7 was no issue
There is a possible fix coming. I updated to the latest HE beta and am now adding back all of my indoor and outdoor Hue motion sensors. 
I have noticed that so far, every Hue sensor added immediately shows up as routing through one of my Sonoff Zigbee 3 dongles. These dongles seem to be much more active on the C-8. Almost everything on my routing table is going through them.
I was hoping to remove most of my Sonoff Dongles once moved over to the C8
Do you have these ones? https://sonoff.tech/product/gateway-and-sensors/sonoff-zigbee-3-0-usb-dongle-plus-e/
Those are the ones I'm using as well.
I'm keeping my SonOff on the C-8 as they appear to play better w/Aqara devices generally than HE hubs. I have some Aqara contact sensors that did not do well when connected to the C-7 until I added the SonOff dongles. My SonOff dongles, like @Ken_Fraleigh, are more active on the C-8 so for now I'm keeping them around to help w/the Aqara contact sensors, which I like very much for their small size and long battery life.
From another thread dealing w/Zigbee issues w/the C-8:
Anyone having issues w/Zigbee I encourage you to join the beta to try out the Zigbee fixes that are being tested. You are never required to install any beta release, and having more hands trying out the fixes will speed getting to a release that resolves the issues some are having.
Those are the ones. I have 3 of them on the C-8 (and 2 on my other C-5) and everything has been very responsive and reliable so far. I didn’t see them very often in routes on my C-5, but on the C-8 they are dominating. I am wondering if it has anything to do with what seems to be more accurate representation of link quality.
This might be due to the hub now being ZigBee 3.0 so they are able to work to there full potential
look slike beta only not avail yet
Yes.
I had a similar result when pairing my Hue outdoor motion sensor and forgot to mention it. In my case the ZIgbee pairing found a Zigbee presence sensor in my car.
I have seen sitiuations w/that device where it might initially pair incompletely and running a second pairing (w/out putting the device in pairing mode) would find it again and complete the process. So possibly something similar here, w/devices not completely joined after migration and then getting picked up/finalized later during another pairing started for another device. Just a theory...
I'm having the same issues with my Philips Hue Motion Sensors: 9290030675
I've been using these for the past few years with no problems. I migrated from C-7 to C-8, and now can't get them to work. I've removed them, factory reset them, and tried adding them... They appear in the C-8 but have no data: motion, temperature, nothing.'
I've tried all of this running with the latest: 2.3.5.113
I've rebooted the device, I've rebooted the radio, I've reset Zigbee... Nothing.
I've tried changing the power level.
I'm not sure what happened in the update, but I'm not the only one with issues.
I see the C-8 trying to add the device but then failing. On this C-8, I have the following:
1-Z-Wave device attached, working.
I'm trying to add two Zigbee motion sensors,
That is all that will be on this device.
I had the same issues with Hue motion, here is what I did to get it to work, I removed them from the C8, removed the battery and let it sit for a bit, them paired them to the hue hub, and made sure they were working devices. Removed them from the Hue hub, did a factory reset and then paired them to the C8, close to the hub. It paired then, I made sure the unit was working, moved it to the garage where it resides, only about 50 ft. And I have had luck with it working for at least 4 days straight it was not working at all before with out it loosing its connection, My other Aqara motion sensors is another story, but give that a try see if it helps. At least until Hubitat guys figure out what the hell is wrong.
My Philips Hue Motion Sensors are working fine now, but unfortunately I'm not exactly sure how I got them working although according to the routing table they are connecting via a repeater. Seems strange when the sensors are close to the hub and the repeater they are connecting to is on the other side of the house. However, they are working so I'm leaving them alone !
The Aqara motion sensors are now working, but I'm not bothered about these.
Only one of mine paired. The other will not repair even after many factory resets.
I will order a different sensor brand, but I believe this is a problem with the C-8. Otherwise, there wouldn't be this thread.
I think a resolution of "eventually pairs" is not a resolution. There is clearly a bug that needs to be fixed.
You could try pulling the batteries and putting them back in and then try to pair. I didn’t have much trouble getting 4 outdoor and 3 indoor Hue sensors connected, but It probably depends on what repeaters you’re using. I’m not saying that there isn’t an issue, and I would recommend waiting for the next firmware update before trying again 
I'd hold off a bit unless you're desperate. First, I know they're working on a fix and it's a priority for them. Second, the issue (or a similar one) affects other devices as well. Hue motion sensors just seem to be the most common. But I've had issues with contact sensors, outlets, etc. You'd hate to go spend money on a different sensor just to have the same issue crop up.
I remoeved my Aqara sensors from the hub and removed the batteries as had replaced them with the Sonoff ones that seem to be more reliable.
However, just as a test I decided to put the battery back in one and give it a test and it paired first time and has been working perfectly since.
So as others have said if you are having issues it might be worth trying to remove the battery for a while.
I have 2.3.6.136 firmware running on my C-8.
I have the Hue Bridge Integration App in apps. I don't recall if I need to do any further setup aside from having this integration. Do I, and if so, what?
I have the Philips Hue V2 sensor, and all I needed to run it on my C-7 was the integration and the sensor; no physical Hue bridge. It set up strong and perfectly the first time and ran flawlessly for two years.
I've moved, and decided to run a C-8 I bought but had not yet started. It is working fine in al respects but getting Hue Integration working (?) and to get my V2 recognized as such. Habitat claims to find it but then never finishes up doing anything.
- Does anyone know when this will work, like it did on the C-7, and if not,
- Would spending the money on a Hue Bridge help, and if not,
- Who has a sensor that actually works, and that:
a) has battery life beyond a week (Zooz I am looking at you)
b) does not use some weird-o and expensive battery (Zooz again)
Thanks, gang!
I'm a little confused - it sounds like you're trying to run the sensor through one of the Hue integration apps, but if you don't have a Hue bridge, I'm not sure that's even possible?
Is there any reason you're not just pairing the sensor directly to Hubitat? I have a couple set up that way and they rock - super fast and dependable.
