@Susiejx welcome to the forum!
One feature of the Inspire 2 is that you have the option to wear it on your wrist or on a clip. If it is set to wear on a clip, the heart rate monitoring will be turned off and the green lights won't be on.
To check this, press and hold both buttons on the sides of the Inspire 2. You'll get a list of settings. Swipe up until you get to the last one. It should say "On Wrist", if you want see your heart rate and sleep stages. If it says "On Clip", tap on that and change it to "On Wrist".
Amanda | Wyoming, USA
Pixel Watch 4, Inspire 3, Sense | Android