Why don't Yandex.maps work on the msk.ru domain?

Question

JavaScript

There are two absolutely identical sites at two addresses. On one Yandex.maps work quite adequately for themselves (.ru domain), on the other they are not displayed for some reason (msk.ru domain).
Prompt, please, with what it can be connected?

Answer 1

Obviously, this is due to the fact that the sites are not exactly the same.