These steps can help regain access to your account: https://goo.gl/v7CdWx We recommend doing this from a known device and/or browser that's typically used to access the account. Here are more tips to help you through the process: https://goo.gl/QtskMp Hope this helps!
Are you referring to account suspension? Check out this Help Center article on account issues and what you can do to appeal: https://yt.be/help/WX8p , if this is not the issue, can you send us a screenshot of the error message? Keep us posted.