first, it may take a while to sync. the watch and the app don’t count steps separately, the whole point is that you can walk and run without the phone and still get the numbers.
Second, I don’t know how trustworthy the numbers are. I ran two other pedometers on my phone for two weeks and made sure I only walked around with both phone and watch, and the numbers were totally unrelated, some days the gap was up to 2X, on others 1.3 or 0.7. I have no idea if the watch is that dependable (probably not) but it’s clear none of the other apps are any better. I’d imagine that to get real, dependable readings, a pedometer would need to be an ankle bracelet, but nobody would buy that now that the market moved to wrist bands.