Inactive Users

How are Last Active Dates and Inactive Users reported?

The system checks for last activity date for users and compares to the configured number of days set within the 'Analytics Settings' in the Connector's Configuration tab.

Not all SaaS Application's APIs are created equal. Meaning, last login dates are not always provided via the integrated API. The Last Active date is derived for an individual User if and when the target SaaS Application's API is able to provide to SaaSLicense information about a User's last login or in some cases, last activity. 
The following factors may impact if a Last Active Date can be derived. When Last Active Date can not be derived, No Information is entered for the User's 'Last Active On'.
    1. If the last login date (or other information such as activity timestamp within event logs) is not available, SaaSLicense displays 'No Information'
    2. If a user account was created within the SaaS application, but they never logged in, SaaSLicense displays 'No Information'

When the target SaaS Application's API does provide this information [last login date or activity timestamp etc] is stored in the SaaSLicense User's record and it is compared to the SaaSLicense parameters set for inactivity as shown below.

inactive setting

For example, users records are created in Salesforce:
User 1's record is created in SFDC 01-20-2019, The last activity timestamp = 04-15-2019.

User 2's record is created in SFDC 03-07-2019, The last activity timestamp = 08-28-2019.

Let's say for example your organization connects and syncs Salesforce to SaaSLicense on 09-16-2019. The configuration for Inactivity is set to 30 days.
Then the Users report list may look like:
For an application like O365, last login date is not available. In this case, SaaSLicense relies on audit logs, if available or the O365 ActiveUserReport is invoked for the last 180 days. 
 In this example, O365 was unable to give Last Activity date information for User A through the API due to its own implementation or limitations.