To enable autoplay for an embedded YouTube short, you need to modify the embed code slightly. Here are the steps to do so:
Obtain the Embed Code:
Go to the YouTube Short you want to embed.
Click on the “Share” button below the video.
Select the “Embed” option to get the embed code.
Modify the Embed Code for Autoplay:
Copy the embed code provided by YouTube.
Look for the src attribute in the iframe code, which typically appears as follows:

Append the following autoplay=1 parameter to the video URL within the src attribute:

Use the Modified Code:
Replace your current embed code with the modified version on your web page or platform where you want the video to autoplay.
Additional Considerations:
The autoplay feature might not work on all devices or browsers due to certain restrictions or settings, such as muted playback requirements.
For browsers that block autoplay by default, you might need to add the mute=1 parameter to the URL to ensure the video plays without sound initially, which is often a requirement for autoplay in many browsers:

By following these steps, you should be able to successfully enable autoplay for a YouTube Short embedded on your site.