VMware Agent ERROR: "Please review the credentials used by the agent for accessing the VC" (4314313)

VMware performance data is not appearing within the Foglight VMware dashboards. Within the VMwarePerformance agent logs, the following can be seen:

YYYY-MM-DD HH:MM:SS.SSS ECHO    <VMwarePerformance/5.6.10/VMwarePerformance/Monitor-VMWare-01-agent> ERROR [Quartz[0]-7] com.quest.agent.esx.task.PerformanceTask - Error during execution: ERROR: null
com.vmware.vim25.InvalidLogin

YYYY-MM-DD HH:MM:SS.SSS 13:53:48.863 ECHO    <VMwarePerformance/5.6.10/VMwarePerformance/Monitor-VMWare-01-agent> FATAL [Quartz[0]-7] com.quest.agent.esx.task.PerformanceTask - An error has occurred while attempting to connect to the VirtualCenter.  Please review the credentials used by the agent for accessing the VirtualCenter.

The username and password have been confirmed as correct.

Ensure the user, that is being used to monitor this data contains the domain, where that user is located. This can be verified by navigating to Foglight console "Administration | Agents | Agent Status | <VMwarePerformance agent> | Agent Properties". For example, the VMwarePerformance agent properties should look similar to the following:

Wrong: vmwarefoglight
Correct: domain\vmwarefoglight