Mixpanel Python API: Geolocation Issue with people_set() Function

I'm using the Python version of Mixpanel and when I use people_set(), it isn't showing the geolocation for the new user. I'm using it like this:

    mp = Mixpanel(mixpanel_token)
    mp.people_set(user_profile["userId"], people_properties, meta={"$ip": 1})

Notice the {"$ip": 1} for meta. I have to use this since I'm NATed and I don't even know the outside IP address. However, the Mixpanel servers only see my outside address so it should be able to resolve it. Anyone know why it is listing my Country Code, Region and City as undefined in the Users section of the UI?