KB3225: Troubleshooting Guest Processing "Test Now" issues
https://www.veeam.com/kb322523.07.2020 · Regarding Warning in VMware Environments. In VMware environments, Veeam Backup & Replication can use two methods to connect to a guest: RPC or VIX. If RPC is testing successfully, it is generally acceptable for the VIX test to fail as it will not likely be used.However, if it is desired to have VIX succeed, please see the relevant section at the bottom of the solutions section.