Administrators who opted-in to the first (early) wave deployment for System Center Configuration Manager current branch, version 1802, have an update available in the Updates and Servicing node of the Configuration Manager console. This update, made available on May 4, 2018, addresses important late-breaking issues that were discovered during the final release process for version 1802.
For more information, including the issues fixed and the applicability of the update, please read:
4132447 : Update 2 for System Center Configuration Manager version 1802, first wave – https://support.microsoft.com/help/4132447