I cannot see a broken embed on the page you have linked so I can’t help you.
but checking your post the code is wrong
<iframe src="https://player.twitch.tv/?channel=jakeparkerlive&parent=www.jakeparker.tv" frameborder="0" allowfullscreen="true" scrolling="no" height="378" width="620"></iframe>
Parents need to be “domain names only” no path/scheme
But this won’t solve your “can’t save” issue with wordpress