FEMA NOPA letter

Has anyone had success in responding to a Notice of Proposed action for unsuitability due to a TS clearance issue? The letter was sent from fema with the areas of concern, which i do have full explanations for everything mentioned. Nothing in regards to criminal activity, as I have a clean record. I did not disclose some terminations from employment, as well as forgot/wrong name for employers due to being a contractor, to a contractor, for a company.