Hope this saves you an hour!  I was attempting to use ovftool to export a VM from VMware vCenter vs. using the Web Client.  I’m learning to use various CLI (command line interface) vs. UI.    I spent a while and here is what I learned.  Hope this helps.

#%5c is a escape character for when using Active Domain user authentication
#The password does not contain special characters
#The VM names don’t contain spaces (simple)
#The minimum vCenter permissions is export OVF App
C:Program FilesVMwareVMware OVF Toolovftool -noSSLVerify “vi://domain%5cuser:[email protected]/DataCenter/vm/Templates/VMName-Not-Template-Prefer-No-Spaces-In-Name” C:tempOutput.ovf