Monthly Licensing Report generation fails with “ReportingJob task error: System.ArgumentException: An item with the same key has already been added.“ error if there is Veeam Backup Enterprise Manager in the Veeam Cloud Connect infrastructure.
Make sure you’re running VSPC v5 patch 1 before proceeding with the installation.
Stop "VeeamManagementPortalSvc" service on the VSPC server.
Replace the files below with new versions in the following directory "C:\Program Files\Veeam\Availability Console\ApplicationServer".
Start "VeeamManagementPortalSvc" service on the VSPC server.