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Embed html background video not autoplaying

Hello,

I have put a video link from Vimeo in an Embed Html link, I can see perfectly my video, however it doesn’t autoplay, when I think I have done the code right.

<iframe src="https://player.vimeo.com/video/421528964" width="1100" height="950" frameborder="0" allow="autoplay; fullscreen" allowfullscreen; autoplay=1&muted=1&background=1&loop=1></iframe>

Can you help?

https://preview.webflow.com/preview/parenthese-cestas-fr?utm_medium=preview_link&utm_source=designer&utm_content=parenthese-cestas-fr&preview=57a2be5556ec8f72da4ada3a78314093&pageId=5ec7c917e6f62967a1299649&mode=preview

Thank you very much