Your above example looks marvelous. Why the player is rendering for you and not for me inside Mastodon remains a mystery. Again, I clicked the link you reference . . . and I am brought to the Mastodon post . . . but as you can see. . . the player is not rendered:
After multiple attempts… after searching for the post inside of Mastodon… instead of clicking on the link… I was able to get the Website to render inside of Mastodon . . . but still the player does not . . . confused . . .
I appreciate your help…