How do I activate a scene from alexa from motion sensor, I can not select it from options…
Currently it is not possible to activate an Alexa scene from the Hue motion sensor. You will need to create a scene on your Hue bridge, and then you can use it on the motion sensor.
A Hue bridge cannot send commands to Alexa (or any other external device) when motion is detected, Philips Hue would need to add support for this first.
Please see the following topic for updates about Alexa support: Amazon Alexa support