Apple Watch series 6 won’t turn on

This happened with my new watch6 and it didn't have enough juice to even turn on,I charged it for about 2 hours and every thing was good,I think the watch might have been in storage for quite a while causing the battery to go flat.

What happened?

Did you charge it for at least half an hour?

Just try charging it for a few hours, at +- 20C°