Instead, you sign in to YouTube with your Google Account email address. This is often Gmail, but can also be a different domain like Yahoo, Hotmail, etc. Learn more about using your Google Account for YouTube.
Sign in with a YouTube username - YouTube Help - Google Help
Instead, you sign in to YouTube with your Google Account email address. This is often Gmail, but can also be a different domain like Yahoo, Hotmail, etc. Learn more about using your Google Account for YouTube.