I just manage to add this door/window sensor to Homey, but the contact alarm is constantly ON. It’s not triggering, it’s just permanently ON all the time.
I had the same issues with TRÅDFRI motion sensor. The sensor triggered ON and was just ON permanently.
Looking through the forums it feels I’m the only one with these issues or the only one using the IKEA stuff?
I haven’t got one myself but it sounds like a similar issue to the zigbee door/window sensor and the Vallhorn zigbee motion sensor that homey users had issues with. Most users were using alkaline/1.5 volt battery. Not sure whether you are also but if you are try using the rechargable 1.2 volt battery. If it’s the same issue as their previous sensors then I suspect having higher volts is causing the issue of it being stuck and not timing out the detection.
I’ve ordered a few of these so I can do a quick test once they arrive. Otherwise you might need to check whether there is a newer firmware update that has addressed any issues
I got these, I have the same issue as SubZane. One sensor shows stuck open, the other shows stuck closed. Found no resolution yet.
which batteries are you using? 1.5v or the rechargeable 1.2v? i know with the previous model which is the parasoll it was providing false notifications. does it make a difference if its close to the homey hub? i havent looked in to matter that much but i suspect it either uses repeaters, wifi, matter, thread, etc or a mixture to have a connection to the homey pro hub. i only have a few matter smart plugs. i dont see how exactly the connection works and whether there are repeaters involved.
i havent had the chance to set mine up. i got my order a few weeks back. i just havent figured out where i could place it just to test it out. im hoping the mount for the parasoll is the same as the myggbett as could potentially do an easy swap on the fridge.
i should have ordered abit more because its been out of stock since i last posted here.
Just got one
Won’t connect to my Thread network, even when 30cm away from Homey Pro.
Same with the new Myggspray sensor. Won’t connect to Thread.
Not a great start with this new IKEA range.
I’m using the ones IKEA sold me 
An update to this. After I used my iphone to connect them instead of using the Homey directly it worked on the 3-5 try. Then it disconnects from time to time, but at least it reconnects automatically. I think I need to buy like matter powered/outlets to extend the range-
But still. Matter of Thread is SLOOOOOOW to connect. I know it’s supposed to be superior to zigbee, but I currently hate matter
Is that the rechargable 1.2v batteries?
I havent tested mine yet. I’m hoping I can use the existing parasol mount to swap it out. From what researched so far it appears it might be the same. I was worried that there wouldn’t be enough powered devices to work as repeaters. I’m not even sure whether my Meross or Tapo matter plugs are repeaters. I would have hoped that ikea released their matter smart plugs at the same time but they didn’t in Australia.
battery devices can never extend the range. You need devices connected to power, light light bulbs or similar
Not talking about range with the batteries. Using 1.5v batteries were causing issues with their previous sensors causing false positives.
Range is limited to the hub and the repeaters.
Someone else in this forum posted has done a good test on the new ikea matter devices in comparison to a similar matter device from another company.
https://community.homey.app/t/ikea-myggbett-door-windows-sensor/149461
Seems like the signal might not be as strong on the ikea device vs aqara when reading Jumpingtrees’ post there.
Got Myggspray up and running but man it is TERRIBLE
The response time compared to an Eve Motion is shocking, but I guess you get what you pay for.
Same for me.. Tried to restart Homey, resetted the Myggbett 4 times and tried to connect.. Times-out during Threads connection. Anyone have any more tips?
How did you got it connected?
I got:
10.Timmerflotte temp.sen (SW.V.1.0.21)
6.Bilresa 2 button (SW.V.1.8.5)
1.Bilresa Scroll Wheel (SW.V.1.8.7)
1.Myggbett (SW.V.1.0.9)
4.KaiPlats GU10 bulbs (SW.V.1.2.0x1) (SW.V.1.1.0x3)To have a Thread Mesh)
(first I connected them via IKEA Dirigera HUB 2 get Software updates (it takes some time)(3 KaiPlats are still connectet to Ikea Hub awaiting sw.updates) when updates is done I connected them to Homey/matter/connect via Android
All are thread conneced via Aqara Hub M3
Every thing has been working good for weeks.. no dropouts
