Why does the Apple Watch 3 keep asking for a PIN?

Question

Apple

Hello.
My Apple Watch s. 3 constantly require a PIN code, roughly speaking, they think that I am filming them.
Maybe I somehow configured them incorrectly?

Answer 1

because they can't see the wrist.
either the sensors are clogged, broken, or there is a tattoo on the arm

Answer 2

or the strap is loose.