Allow me to get you pointed in the right direction to get assistance with running a report that a includes unique ID for customers.
In handling situations like this, It'd be best to reach out directly to our Intuit Developers Department. This department is the resource for such inquiries as they are able to provide you with more details about running a report with unique customer ID's.
However, you're always welcome to post again here in the Community if you have any questions with QuickBooks. I'm always ready to lend a helping hand.