cravetv website won't let me use it because of third party cookies, why?

I have a Macbook pro, 2016! I am trying to log into my Cravetv account and it keeps telling me this ?"We have detected that your browser is blocking third party cookies which are needed for authentication. You are required to enable third party cookies" - I have enabled cookies for this site in my settings (following the instructions provided:Safari for macOS Sierra: Manage cookies and website data using Safari,) but it still won't work. Does anyone have any suggestions?