How should you address an issue with a Portal for ArcGIS user account that is no longer valid?

To address an issue with a Portal for ArcGIS user account that is no longer valid, utilizing the configureserviceaccount utility is the appropriate action. This utility is designed to help configure service accounts and can assist in resolving problems related to user account validity. It helps ensure that the account settings are properly aligned with the necessary permissions and configurations within ArcGIS Enterprise, thereby allowing the user to regain access.

The other options may not effectively resolve the issue. Reinstalling the entire ArcGIS Enterprise would be excessively drastic and time-consuming, possibly causing additional complications and downtime. Contacting ESRI support for account recovery is a viable approach but typically serves as a last resort after standard troubleshooting methods, such as using the configureserviceaccount utility, have been attempted. Deleting and recreating the user account might temporarily solve the issue but could lead to loss of user-specific data or configurations, which is not an ideal approach when simpler fixes are available. Therefore, using the configureserviceaccount utility is the most efficient and effective method for addressing the validity issue of the user account.