Regarding NICS laws and Background Checks. A question.

[Raine1967]

I just read this about federal checks: https://www.fbi.gov/about-us/cjis/nics/appeals/nics-appeals-process/reasons-nics-background-checks-are-denied-or-delayed

A federal prohibition would exist for any person who:

Has been convicted in any court of a crime punishable by imprisonment for a term exceeding one year
Is a fugitive from justice
Is an unlawful user of or addicted to any controlled substance
Has been adjudicated as a mental defective or committed to a mental institution
Is an alien illegally or unlawfully in the United States or who has been admitted to the United States under a non-immigrant visa
Has been discharged from the Armed Forces under dishonorable conditions
Having been a citizen of the United States, has renounced U.S. citizenship
Is subject to a court order that restrains the person from harassing, stalking, or threatening an intimate partner or child of such intimate partner
Has been convicted in any court of a misdemeanor crime of domestic violence
Is under indictment for a crime punishable by imprisonment for a term exceeding one year

I know that I can cross post this to the other group but I feel more comfortable asking this here.

When a person is denied or delayed a gun purchase, are they informed as to the reason why? Are they just simply denied?

Anyone familiar with what happens after a gun purchase is denied?