If you used a credit report to note the disparity in USPA, then
YES , the FCRA notice requirement is triggered because you "relied wholly or in part" on information obtained in a credit report. In general, though, the incomplete application provision of Reg B - preempting the need for an AA form - is caused by the bank failing to get one or more pieces of information from the consumer, and not from anything conflicting in the credit report (in which case the FCRA notice is not triggered).