The loan approval was conditioned on the borrower obtaining flood insurance, an underwriting requirement communicated to the applicant. The applicant refused to provide the flood insurance. You have a denial for failure to purchase required insurance. You would not make the loan as applied for, no flood insurance, therefore you took adverse action and need to follow the notification requirements of 202.9.
I would also provide the insurance agent a copy of FEMA's May 2008 letter about agents are to write the policy in the most hazardous zone if there is a discrepancy, file a complaint with FEMA and the state's dept. of insurance.
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The opinions expressed are mine and they are not to be taken as legal advice.