Below, error is seen on the EV Administration Console:
Unable to install the FSA Agent. To install the FSA Agent from the Adminstration Console, either the Vault Service account must have local Administrator privileges on the file server, or you must run the Administration Console with an account that has those priviliges.

The lines below will be seen in the DTrace of the MMC process:
DirectoryService: Method call: CGroupSIDFromUserSID using UsernameDomain, param (EVLAB\vsa, vsa, EVLAB) |
DirectoryService: CGroupSIDFromUserSID using UsernameDomain: Calling GetDCNameFromDomainName |
DirectoryService: GetUsersGroupsInfo: Attempting to get user groups |
DirectoryService: GetAllUsersGroups: Getting Local Users Groups using Local Machine and a username of EVLAB\vsa |
DirectoryService: GetAllUsersGroups: Looping through the groups |
DirectoryService: GetAllUsersGroups: Ensure group name is valid |
DirectoryService: GetAllUsersGroups: Compare group name |
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{CACFileServer::OnRemoteInstall:#385} - Failed to Push file server entry id on the file server. Error: user is not an Administrator on File Server
The issue occurs if the local Administrators group name on the EV Server is different from the name of the local Administrators group on the File Server.
The local Administrators group name can be changed on either File Server or the EV Server to match with the group name on the other server.