Your post is being downvoted because blocking cookies does not solve the problem. It is blocking cookies that causes the issue. When cookies are blocked (in my case, third-party cookies are blocked), an overlay appears over the video explaining the website that hosts the video will not allow the video to be played without a targeting cookie. FWIW, removing the overlay was not enough to get the video to play on the website; but I haven't looked any further into it—easier to just go to YouTube to play the video.