Could the Other Agency Solve This?
A Fannie denial is not automatically a Freddie denial—and a Freddie problem is not automatically a conventional-loan problem.
Run the second-agency check when the issue involves
income calculation, rental income, self-employment history, debts, assets/reserves, property type, subordinate financing, non-occupant borrowers, refinance classification, affordable products or an AUS-specific risk result.
Do not confuse four different answers
Agency rule: what Fannie/Freddie publish. AUS result: what DU/LPA determines for the complete file. Product/MI rule: restrictions tied to a particular execution. Lender overlay: a lender's rule that can be stricter than the agency baseline.
Official agency baseline
Fannie Mae Selling Guide · Freddie Mac Seller/Servicer Guide
These are agency-level rules. AUS findings, mortgage insurance, product restrictions and lender/investor overlays can still affect a real loan.