Have anyone received this type of notice from USCIS and by the way USCIS cancel my N400 interview. We have approved your I-751, Petition ot Remove Conditions on Residence. Our records also indicate we have approved your Form N-400, Application for Naturalization. Because we also approved your N-400, you will not receive a new Permanent Resident Card (also known as a Green Card). Instead, once you have taken the Oath of Allegiance, you will receive a Certificate of Naturalization, which wil be proof of your US.. citizenship. If you have any questions regarding this process, please contact the USCIS contact center at 800-375-5283.