This sensor is using SOAP and not SNMP, so your SNMP settings won't matter here.
In PRTG you have to enter the ESXi credentials, not the SNMP community password.
Are you sure you meet all requirements for this sensor?
Requires .NET 4.0 or higher to be installed on the probe system.
For this sensor type you must define credentials for VMware servers on the device you want to use the sensor on. Ensure you enter
a user with sufficient access rights to obtain statistics (read-only
This sensor only shows items that report an actual status, so you might see more "sensors" in your vSphere client than the number of
states available in the channels of this PRTG sensor.
The parent device must be a VMware ESX/ESXi server version 4.0, 5.0, 5.1, 5.5, or 6.0. We recommend that you do not use this sensor type on your vCenter. Reliable hardware information can only be
provided when this sensor is created on your physical host server as
We recommend Windows 2012 R2 on the probe system for best performance of this sensor.
Note: This sensor type can have a high impact on the performance of your monitoring system. Please use it with care! We recommend that
you use not more than 50 sensors of this sensor type on each probe.