Failed to execute ‘postMessage’ on ‘DOMWindow’: https://www.youtube.com !== http://localhost:9000

I believe this is an issue with the target origin being https. I suspect it is because your iFrame url is using http instead of https. Try changing the url of the file you are trying to embed to be https.

For instance:

'//www.youtube.com/embed/' + id + '?showinfo=0&enablejsapi=1&origin=http://localhost:9000';

to be:

'https://www.youtube.com/embed/' + id + '?showinfo=0&enablejsapi=1&origin=http://localhost:9000';

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