Symptoms
When you try to comment on a YouTube video, a pop-up window briefly appears and then disappears quickly. You are unable to post the comment or reply to an existing comment.
Cause
Google requires you to enable third-party cookies in your browser's settings before you can comment on YouTube videos.
Resolution
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Enable third-party cookies in your browser's settings. Then, refresh the page on YouTube.
OUTCOME
You will be able to comment on YouTube vidoes.