hey @adminsrs ,

These logs should help: 

• /var/log/vmware/vpxd/vpxd.log on the vCenter Server
• <drive>:\Program Files (x86)\VMware\vCAC\vCenter\<agent name>\Logs\vSphereAgent.log on the vCAC server

Furthermore, I found something online related to your issue @Daniel_7 :

To fix the issue, you need to make sure that all of the devices that you are trying to add to the VM have unique device keys. You can do this by generating a new device key for each device. You can use the following Python code to generate a device key:

import uuid

def generate_device_key():
  return str(uuid.uuid4())

print(generate_device_key())

This code will generate a new device key and print it to the console. You can then use this device key to add the device to the VM.

Once you have fixed the issue, you should be able to add the devices to the VM without any errors.

Here are some additional things to check:

• Make sure that you are using the latest version of vCenter Server and vCAC.
• Make sure that the vSphere Agent is installed and configured correctly on the vCAC server.
• Try restarting the vCenter Server and vCAC server.