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BugZero found this defect 3882 days ago.
This article documents how to completely uninstall the Local vSphere Client Plug-in and reinstall it from scratch.
To reinstall the plug-in: In Veeam Backup Enterprise Manager, go to the vCenter Servers section of the Configuration view. Select the vCenter server you need and click Check version. If a connection to the vCenter server is successful, and the plug-in is installed in the vSphere Web Client, the Remove link will become active. Click the link to uninstall the plug-in. After the uninstall process completes, the plug-in status for the vCenter server in Enterprise Manager will change to Not installed. The plug-in will also be removed from the list of plug-ins in the vSphere Web Client. On the vCenter server, restart the following services: VMware vSphere 7.0.0.x with the HTML 5 user interface - restart the VMware vSphere Client service named vsphere-ui. VMware vSphere 6.7.x with the HTML 5 user interface, restart two services: VMware vSphere Client (vsphere-ui) VMware vSphere Web Client vsphere-client for vCenter Server Appliance implementation or vspherewebclientsvc for vCenter Server on Microsoft Windows Server VMware vSphere 6.5.x and earlier with the flex/flash user interface, restart the vCenter Web Client Service vsphere-client for vCenter Server Appliance implementation or vspherewebclientsvc for vCenter Server on Microsoft Windows Server). Ensure no plug-in components remain on the vCenter server: In the case of vCenter Server Appliance, open an SSH session to vCenter Server Appliance and remove all entries returned by the find / -name '*veeam*' command. In the case of vCenter Server on Microsoft Windows Server, log in to the OS and remove all files and folders that contain veeam in their names from the %programdata%\vmware and %programfiles%\vmware folders. Install the plug-in once again. See the Installing vSphere Web Client Plug-in section in the Veeam Backup Enterprise Manager Guide for details.
For a complete list of requirements to install the Plug-in, please review the Getting Started section of the Enterprise Manager User Guide.