autoplay won t work with embeded video

I have an issue with the autoplay function for embeded youtube video's

My presentation is shown on:

https://docs.zoho.com/show/publish/1d7724c1417da25304873919fb2ea598fa70a

I use the next embeded code:

slide transistion is set automatic by time
the slide is presented
Youtube screen is shown
autoplay is on (see embeded code)
but the video won't start by itself

Any help on how to autoplay an embeded youtube video?

Kind regards,

Léon van Knijff

P.S. I have the same issue with a Prezi embeded code, but I think this is a limitation within Prezi.

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