Why can't my passport scan be processed for the DTV application?

Users are experiencing issues with the DTV application where their passport scans are not being accepted. The message indicates that the system cannot read the biographic information from the machine-readable zone (MRZ) of the passport. Suggestions from other users include using a photo instead of a scanned image, trying an iPhone's notes app for scanning, and ensuring the MRZ is clearly visible. A past experience highlights that photos can sometimes work better than scans for this process.