Hey there, thanks for reaching out. Account issues are always frustrating and want you back in the Virtual World as fast as possible so I will do my best to assist you. Are you having issues with your Facebook account itself or does your issue lay with trying to log into your account using Oculus? Also, what exact error message are you seeing?
If you are having issues with your Facebook account, this link will be of help: click here
If you are having issues with accessing your Oculus account, you can submit a support ticket here.