@HeatGun Here's the response from the Congressman:
"In response to my inquiry on your behalf, I received the below correspondence from the United States Citizenship and Immigration Services. I deeply regret that this matter could not be resolved in your favor.
Thank you for your inquiry regarding this constituent’s immigration matter. A review confirms your constituent’s Form I-751 application is currently pending alongside their Form N-400 application and will be processed simultaneously by their local field office at the time of the N-400 interview.
Their Form N-400 application is currently awaiting interview scheduling by the Phoenix Field Office. Although the A-File is still physically located at the National Benefits Center (NBC), the scheduling of your constituent's interview is within the jurisdiction of the field office. Once the field office schedules this case for an interview, your constituent will receive an interview notice stating the date and time to appear for the scheduled interview. Once the interview is scheduled, the NBC will then forward the file to the field office.
Processing time information for the Phoenix Field Office can be found on our website on the USCIS Processing Time Information page.
Thank you for the opportunity to be of assistance. If you have any further questions, please do not hesitate to contact me."
@HeatGun Are you also applying under the 3-year rule?