An employer is required under the FCRA to tell you if there is an adverse action taken because of the credit check. That way you have the right to dispute it. So if you were not hired and this is the reason you are supposed to be told. I copied the below from an equal rights website.
Before the adverse action is taken, the employer must give the applicant a "pre-adverse action disclosure." This includes a copy of the report and an explanation of the consumer's rights under the FCRA.
After the adverse action is taken, the individual must be given an "adverse action notice." This document must contain the name, address, and phone number of the employment screening company, a statement that this company did not make the adverse decision, rather that the employer did, and a notice that the individual has the right to dispute the accuracy or completeness of any of the information in the report.