You have a web page URL not the actual stream for the media_content_id:
This should work:
media_content_id: ‘https://s1-bos.liveatc.net/kewr_twr’
You can find that URL in the HTML source (look for the media element)
You might also need to change the content type to media_content_type: ‘audio/mpeg’ – not sure how picky different players are.