Invalid user switch
This issue is typically due to spaces or additional characters within the path(s) in the command depending on the switch that is being used.
Run the command using quotes to enclose the path. For example when using the restore (-t) option use the following syntax:
FSAUtility -t -s "\\ServerA\Share\Folder one\Folder two" -d "\\ServerB\Share\New Folder\New Folder Target" -l 0
This command will send the source data to a different target and log errors and successes.
Note: FSAUtility should be executed from an Admin CMD prompt as the Vault Service Account.