Hi all. I post couple posts about not receiving any notifications on watch 6 classic. Issue sorted out simply. My arms are all tattoo and watch can not read your watch. All what u need to do is go to your watch settings > security and privacy> turn off wrist detection and all my notifications now works like a rocket.
My watch 6 is since lounch as well. 4 month I was sending Samsung experts video about no notifications and no sound and vibration on calls. After I took off wrist detection and get software update ( 2 weeks ago) everything works fine now.