So there appears to be no SNMP configured (apart from the minor variables listed). You may want to review to following article to get SNMPv1/v2 or v3 configured and enabled. It would be best to test with v1/v2 and move to v3, if needed:
The VDX can be added for simple SNMP monitoring at this time. For configuration changes and advanced management, this may come later. The release notes below does list the currently supported platforms:
Could you check the running config on the VDX to see what is currently configured for SNMP? We may have to setup an SNMP profile in XMC based on the SNMP credentials or communities configured on the device.