When you are trying to embed a live video stream in the Video tile, the apply button is greyed out/disabled, causing you to not be able to publish the video tile.
This occurs when you are trying to embed a video that's not supported by Embedly. The workaround in such cases is to use the Custom HTML tile to display the embedded video in an iframe.
Sample HTML code (for reference purposes only):
font: 13px "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif;
<iframe src="https://example.jivesoftwae.com/player/player.php?alias=a1b2c3d4e5f6" width="150" height="300">
You can customize the code as needed for your embedded video including the width and height of the video.