My wife's conditional GC was issued on Sept 19 2019. Filed the I-751 in June 2021 and its still pending. While waiting, she received two extention notices of 18 and 24 months which were dated 6/24/2021 and 11/08/2021. We filed her N-400 in June 17, 2022 which was within the 90 day period. USCIS rejected it and said its outside the 90 day period. My question is, are they going by the extension dates or the original date on her GC?