Motion Sensor module issue

So have had the system for a short time, put a motion sensor in my garage, it was working fine then quit talking the system - brought it into the house - app shows battery is normal, signal strong - to make a long story short - I deleted it and then tried to reinstall it - the LED won’t come on when you insert the tool? Couldn’t get it to connect again.

I had purchased additional motion sensor’s that I hadn’t installed yet so to one out of the box and it worked as expected and I put that one out in the garage.

Do I have a defective unit or do I need to take it apart to remove the battery to power cycle it or what could be going on? The LED not blinking tells me it’s probably the unit right?