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's optional. Eventually we may make verification mandatory to get listed on the cross platform leaderboards, as currently, people can link accounts they don't own. So it's good to verify if you can.