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BugZero found this defect 1271 days ago.
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". Veeam.MBP.LicenseManager.dll Veeam.Portal.DataManagement.dll Veeam.MBP.Service.exe Start "VeeamManagementPortalSvc" service on the VSPC server.