Hello Victor,
A couple of questions:
1. Is the vCenter Server running on Windows or it is a Linux appliance? And what is the vCenter Server version?
If the vCenter Server is running on Windows, there must be running a Windows service named "VMware VirtualCenter Management Webservices".
2. Is the vSphere client from which you deploy connected to the vCenter Server or to the host? It needs to be connected to vCenter Server, for the Extension vService.
Regards,
Martin