Are you able to boot to the USB (Setup.bin) on your Dell OptiPlex 7040 (MEBx v11.0.0.0005) ? You should be getting a prompt for USB configuration during boot time, it is possible that you need to enable USB provisioning in your BIOS settings in case you are not getting the prompt.
Also, what is the command and error message you are getting when running ACUConfig.exe on your OptiPlex 7040 ?
In any case, I recommend you to enter a biz-support ticket for this issue to be reviewed by a customer support profesional , go to https://bizsupport.intel.com and enter your ticket, Intel employees are no longer tracking this forum on a regular basis
Thank you for the suggestion, I have submitted a business support ticket to Intel.
Yes, the setup.bin file is applied to both computers; both computers are MEBx configured exactly the same.
The error message is the generic TCP error. "0xc000521c: A TCP error occurred. Make sure that the destination settings are correct and that a network connection exists to the target."
I have never found the TCP error to be helpful; there are too many reasons why the SCS server might not be able to reach the client.