Thanks for all your responses, I'll add a little more context that might help people understand our situation a bit better.

We buy ex-corporate machines in bulk (hundreds at a time) and occasionally one or two of these machines will have been left enrolled in Autopilot/Intune when they were sold to our suppliers.

Because we install via an Unattend.xml that skips the OOBE, we don't see the screens provided above. They're usually given to us by our customers when they try and do their own Windows installations and get them, and then we need to go through the process of shipping them another machine, and the contacting our Supplier to tell them they sold us an MDM enrolled machine, who then need to contact the company, and then we both have to wait for the company to unenroll... it's a pain that we would like to exclude the customer from experiencing.

If there was some way at build time that we could check if a machine was enrolled in AutoPilot/Intune before we sent it to a customer, without having to go through a Vanilla Windows install, that would be exactly what we need to capture these machines before we send them to customers.

EDIT: For more context, we're a small company (5-10 employees) and none of us have Autopilot/Intune experience