ESXi hosts are not getting discovered in ServiceNow CMDB discovery using a MID Server.

Products

• VMware vSphere ESXi

Issue/Introduction

•  ServiceNow CMDB Discovery successfully connects to vCenter and retrieves certain objects (like Datacenter, Folder) but ESXi hosts and VMs residing in it are not being discovered.

Environment

• VMware vCenter Server Appliance 8.x
• VMware vSphere ESXi 8.x

Cause

• This is mostly observed if permission to the AD account is not properly assigned to the respective vCenter inventory objects.

Resolution

• Verify if the AD user account is present.
• Add the AD user to the Global Permission with read-only role and Global > License privilege in vCenter.
• Propagate the permissions to the child objects.

Additional Information

Reference Document : 

Creating and assigning a role with privileges to create and manage virtual machine to a Domain or Local User/Group

Servicenow vCenter Discovery | Step by step Discov... - ServiceNow Community

Understand vCenter Discovery process and troubleshooting - Support and Troubleshooting