Take a screenshot on Netflix?

I was just about to take a screenshot on Netflix, but it just turns black. With a friend it works perfectly. What could that be?

My cell phone: Xiaomi Mi A 3

The friend's cell phone: Samsung Galaxy A 50

It is often due to the cell phone or browser. You can't take screenshots on an iPhone. With my MacBook I can't take screenshots on Safari, but I can take screenshots on Mozilla Firefox.

Normally it should be me because of copyright and so Netflix prevents something like screenshots and screen recordings