Garmin 245 wrist monitor light always on

Hi! Just got this device (without music) and I noticed the green light for HR wrist monitor is always on. 

I believe it should be on for a few minutes and then off, but it goes on constantly and then blinks like crazy for ages. 

The WHR version is 20.04.40. I have the latest software updates on the watch. 

Any ideas how to solve this? Thanks!