Video unavailable in mobile template of mainroad theme

For some reason sometimes YT video can’t be shown when site is in mobile mode.
Of course i am talking about youtube shortcode:

{{< youtube xxxxxx >}}

Website is showing “Video unavailable Watch on YouTube”.
I suppose that is somehow related to unlisted or private videos.
However in desktop mode everything is working fine.

Any clues?

Probably related to privacy policies from your browser and Youtube. You might want to show an image with a play button on top and link to youtube. That always works…