N-400 RFE asked at the day of the Interview
My friend had a naturalization interview on June 28. He passed the tests, but they asked for tax transcripts for the past 3 years and proof that he is current with all of his income state tax obligations.
On July 11 he went in person in Chicago USCIS office and gave the required evidence. On the same they, he received email that a recent action was taken on his case. The online status was saying that request for evidence was asked and he has deadline until June 28 to do so. Once again, he gave them the required documents on July 11.