The Validation rule "Invalid TANF" is broken when the value for an application's case number (also known as benefit number, TANF, Foodstamp number, etc.) does not match what RocketScan expects to find in that field. This is managed in RocketScan's Form Management using a regular expression and is typically set up by Image One during your initial install.
Due to the complicated nature of regular expressions, we advise contacting Image One support if you would like to manage what RocketScan will recognize as a valid case number.