FYI
After Sept. 18, you’ll no longer be able to send or receive direct messages on YouTube as we focus our efforts on public convo tools (comments, posts, etc).
You can still share what you’re watching w/ others via the Share icon below videos.
More→ https://yt.be/help/9Hns
Well There Are Some People Who Still Use YouTube Direct Message And I Understand Your Removing It But Why Not Make YouTube Messaging It Own Separate App I Know That There Google Hangouts And Others But It Just A Idea I Had