How can a passport fail the Machine Readable Zone validation check? June 20, 2017 13:47 Updated A passport could fail the check in the MRZ (Machine Readable Zone) if the image provided is not of a sufficiently high quality. It's important for your users to take photographs of documents at a 90-degree angle and on a clear, flat background. Related articles What does an exclamation mark mean next to an uploaded document? What is the Document Verification Panel? How can I save Identity Documents uploaded by a user?