i have the same issue.

But i found a little workaround if you need this autoplay on fix browsers.
I use the embedded windy for build a weatherstation on a Tablet with chrome browser. I spended much time but find only this way to become a working autoplay.

The script is tested at Firefox and Chrome browser, there we have the tampermonkey app, at firefox on android,too

But i have realy no idea how i can run this script on apps like kisok mode or other browser whre had no function to run tampermonkey.

I have installed the app tampermonkey on my chrome browser and implemented there this script:

// ==UserScript==
// @name Windy Auto Play
// @namespace http://tampermonkey.net/
// @version 0.1
// @description Automatically click the play button on Windy after 10 seconds
// @author Your Name
// @match https://embed.windy.com/embed.html*
// @grant none
// ==/UserScript==

(function() {
'use strict';

// Wait 10 seconds before clicking the play button
setTimeout(() => {
    const playButton = document.querySelector('[data-ref="play"]');
    if (playButton) {
        playButton.click();
    }
}, 5000);

})();

I hope windy find a way to implement this in the embedded part,too.