To view a user's Sign In History:
  1. Navigate to  Core persona.
  2. Hover over People Finder > Search/select the user you would like to view Sign In History for.
  3. Select the Access Tab
  4. Under the Log In Information, Select View Login history

This will allow you to view sign in information, such as successful logins, incorrect password attempts, if the user was locked out, and date/time/IP address information.