You can only watch a private YouTube video if the owner explicitly shares it with your Google account
Ask the video owner to add your Google email address to the video’s private sharing list
Sign in to YouTube with the exact Google account that was granted access
Open the private video link after being granted access
If you still cannot view it, ask the owner to resend the invitation or check that the correct email was added
If the video is unlisted instead of private, use the direct link shared by the owner
Do not use third-party tools or methods to bypass private video restrictions