Not a problem.
Sure, bring a new N-400 and let the examiner decide if he/she wants that form .. or will just amend the original one.
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At the interview, tell the officer.
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Before the IO gets to it at the interview, be upfront and seek to amend your application to include this information.
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I did this with a client. Before they were sworn in, we told the officer about the omission and offered an amended N-400. He placed it in the file and continued the interview and we eventually were successful.
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