What action should be taken to ensure a new user from Active Directory is added to Qlik Sense after synchronization has failed?

To address the situation where synchronization of a new user from Active Directory into Qlik Sense has failed, checking the user data in the User Directory Connector (UDC) and then re-running the synchronization task is the appropriate action. This option is the most effective because it allows the system administrator to validate and correct any potential discrepancies or issues related to the existing user data that may have caused the synchronization to fail initially.

In Qlik Sense, the UDC is responsible for managing user information from the external directory. By reviewing the synchronization logs and ensuring that the user data is correct, any errors can be addressed before attempting the synchronization again. Re-running the synchronization task will then attempt to add any new users and update existing users based on the corrected data, ensuring that the user is properly integrated into the Qlik Sense environment.

Other options do not effectively address the issue at hand. For example, simply waiting for the next scheduled synchronization may not resolve any potential problems, and manual input of user data can lead to discrepancies or errors. Removing and re-adding the user in Active Directory does not ensure that the underlying issue is fixed, meaning that the synchronization will likely fail again. Therefore, verifying and re-running the synchronization task is the most comprehensive and efficient approach.