What is the primary reason people outside the poles might incorrectly believe the Moon is not visible?

Answer

Its phase combined with the time of day.

The main reason someone away from the poles might think the Moon is not visible is due to its phase and the time of day, especially if they only look after astronomical twilight ends.

What is the primary reason people outside the poles might incorrectly believe the Moon is not visible?
EarthMooncelestial bodyVisibility