Don’t put the carabiner in the harness and the rope in the carabiner!
This is something we often see with many mountaineers, but never with Swiss professionals!
When climbing, on glacier tours, or on mixed ice-rock routes, the rope is directly tied to the harness. Usually, the figure-eight knot is used, but there are also knots that are easier to untie than the figure-eight.
The carabiner can be stressed in the wrong direction, may fail, and there’s no point in “using it up” by putting it in the harness in such a risky and completely unnecessary manner, as shown in the video.