We recently had an issue deploying either an OVA/OVF file that was created from one of the virtual machines in our environment. Deploying this OVA failed instantly (after entering cluster locations / datastore) with the following error: "The Operation is not supported on the object". After much investigation and examining the /var/log/hostd.log file on the ESXi host we were trying to deploy too, we found the line: "Video Ram size edit is not supported when auto-detect is True." Editing the Virtual Machine hardware settings and editing the Video Card and changing the setting from Auto-detect to Specify custom settings (This can be anything) and then exporting the virtual machine as an OVA allowed the deployment to work! Very interesting that this setting caused a problem! Previously we have also encountered this when the Virtual Machine has an ISO mounted when to converting to OVA.