Ring Motion Detector (2nd Gen) not sensing movement

I have recently purchased a full alarm system and installed all of the components successfully.

One of the motion sensors is not sensing movement even though it is linked and showing up in the app. I have factory re-set the sensor but still not working. Pressed the button on the front and shows single green light.

Any ideas what might be wrong (Or do I have a faulty sensor)?

Hi @user38147. You can find information on the proper setup and use of the Ring Alarm Motion Detector, along with troubleshooting steps, here. If it appears to be setup correctly and is still not detecting motion, I’d recommend utilizing the test mode to see if it responds. Should that still not do the trick, please give our support team a call at one of the numbers available here. If you are outside of the US, please visit here to see how to contact support.