Is this in the Las Vegas office? I got into the same situation. My husband and I were interviewed separately (stokes interview )which we believed got triggered from us not wearing our wedding rings. We called a lawyer and he knew the IO as she usually does it with applicants, and that she was also new. She refused to do my N400 and I’m still waiting for a rescheduled date at the moment. Our i751 got approved the next day though and got a paper notice saying i751 and n400 were approved so I wont be getting 10yr gc but I would get the naturalization cert. i dont really know what to expect from here, but I’m still waiting for a new rescheduled n400 interview.