I need to test this out. 

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Happened to me using chrome browser.This might have been mentioned but this is ONLY happening in the app, right? Or are some people in this thread having this happen in a browser?
That's the spirit!This is so frustrating.
I'm not giving up until this is solved.
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My feelings right now.
I still want to solve this issue
My two theories are that it either has to do with the encoding of the video such as the viewport, or it is an app error.
@KikisGirls google how to fix your viewport on a youtube video.
It's in English.Google tells me this:
This is in a foreign language.
How to Fix Mobile Usability Viewport Not Configured Issues - YouTube