The FCRA does not address joint reports that I am aware of. If it does I have not seen the opinion, but that doesn't mean one doesn't exist.
A joint report is a combination of the applicant's report and the co-applicant's report. The report still identifies what information would be in each individual's report.
The co-applicant's information in the joint report would not appear in my individual report. I would only be entitled to the FCRA AAN if my individual information had a part in the adverse action.
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The opinions expressed are mine and they are not to be taken as legal advice.