If this option is selected, when people log in to their user area for the first time, it will prompt them to complete their profile fields before they can see their dashboard.  You can try this and show screenshots of the admin area and also the user area or what they will see when they go to login and see they have to update profile first.

1. Click "Setup" in the Admin Dashboard

2. Go to "Settings" and click on "Show Advanced Settings" 

3. Look for the option "Require all profile information after user logs in" and click to Check this option. And then click "Update."