@TeamYouTube , why YouTube Pinch-To-Zoom Functionality is not available on all devices with the latest version of the YouTube android application?
This could be a device issue but try the steps outlined here: https://yt.be/help/sWdH If the issue persists, we recommend you send feedback here https://yt.be/help/feedback . You may not get a response but we review all feedback and use it to prioritize requests & fix issues!