There are many reasons why a green card application may be denied. Insufficient evidence, failure to respond to a Request for Evidence (RFE) or Notice of Intent to Deny (NOID), marriage-fraud, failure to appear at an adjustment of status or consular processing interview, insufficient financial resources, incomplete or missing forms, medical conditions, criminal activity, unlawful immigration status, accepting public benefits, working without a work permit, and unlawful entry to the United States are some of the reasons why a green card application may be denied.