LMS java script video autoplayer

Hi,

I am designing in Storyline 360 using a Java Script and embedding a video from amazon aws, using this code : 

<iframe src="_____" width="1812" height="1019" frameborder="0" webkitallowfullscreen="" mozallowfullscreen="" allowfullscreen="" data-var="Sit1_Vid1"></iframe><script src="vimeo/api/player.js"></script><script src="vimeo/main.js"></script>

 it's works, but... the video is not in autoplay so I'm used this code 

<iframe src="_____?autoplay=1" allow='autoplay' width="1812" height="1019" frameborder="0" webkitallowfullscreen="" mozallowfullscreen="" allowfullscreen="" data-var="Sit1_Vid1"></iframe><script src="vimeo/api/player.js"></script><script src="vimeo/main.js"></script>
 

but still not started in autoplay 

I need some help to find the solution to this

Thanks 

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