I am having the same issue. This is the reason I gave up my fitbit because the step count was extremely off and would count steps while sitting down at my desk. My galaxy active 1 used to notify me when I needed to get up and walk and give me an option to stretch. After awhile it stopped doing that and would just count me as moving when I am sitting down. The active 2 is doing the same. It will notify me that I have been inactive and as soon as I look at my watch to see the notification it quickly goes to great you are active again when all I did was lift my arm to look at my watch. It is very inconsistent and I too would like to know if this will be fixed otherwise I will be giving it up and going back to my fossil q wander.
I am having the opposite problem. I regularly get 10,000 steps at work alone and since switching to the Active 2 from Fitbit, I am averaging 4000. It doesn't count my flights of stairs either. So far I am very disappointed in the watch.
I am having the same problem as you are. I went from a Fitbit to the Active 2, and it is A LOT harder to get my steps in. I went from getting 8-10,000/day to having to struggle to get 4000.
Is there a way to adjust the sensitivity of the watch's step counting?
This is all unhelpful. Up until today my Gear S3 has counted steps fine. I had to reset as the watch doesn't play well with iPhone, and now it will only count steps when on a watchface that doesn't have a step counter!!!!!
I've tried all the suggestions here but no dice.
Is there an update here re whether the current software has a fix -