Autoplay video attribute not working

Hello,
I was playing around with the element of html, and I noticed that it autoplay doesn’t actually work. This is the code:

<video src="https://codecademy-content.s3.amazonaws.com/courses/Semantic+HTML/dog+video.mp4" autoplay controls >
      </video>

and this is the link to the lesson:
link

I’ve tried loop and controls, and they both work fine. Am I doing something wrong here?
Thank you for your help in advance

In some browsers (e.g. Chrome 70.0) autoplay doesn’t work if no muted attribute is present. -MDN

Autoplay will work on Chrome if the video is muted, you can just add the word muted after autoplay

Autoplay Policy Changes - Google