While Reg. B is ok with giving only the primary applicant an AAN, i think FCRA would say in this instance both need one. Here's the reference i'm looking at, and since i see no distinction made, i think "a consumer report" has to be looked at as "either consumer's report". In other words, applicant A is getting adverse action because of applicant B's credit report, but both need an AAN because both are getting adverse action based on information obtained from "a" consumer report. Just my interpretation of how that reads.
a) Duties of users taking adverse actions on the basis of information contained in consumer reports. If any person takes any adverse action with respect to any consumer that is based in whole or in part on any information contained in a consumer report, the person shall
(1) provide oral, written, or electronic notice of the adverse action to the consumer;
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I'm fixin' to fix that.