Steam recently changed the default privacy settings for all users. This may impact tracking. Ensure your profile has the correct settings by following the guide on our forums.
If your profile is showing up as Not Ranked, please review our rules page and follow the appeal process detailed there.
It needs to match the username shown in your Steam profile URL. It might be a string of numbers (Steam ID) if you haven't set one yet. Providing the Steam ID will also work here.