Be prepared for anything. A friend of mine with a similar situation (I-751 combo with N-400) had trouble at the USCIS office in Jacksonville, FL back in 2022. The security officers wouldn’t let her in, even though she brought her spouse’s deployment orders, he was stationed in Korea at the time. She begged and cried, but the security wouldn’t budge.
Fortunately, an immigration officer happened to walk by, asked what was going on, and told the security to let her in. He ended up being the officer who interviewed her. During the interview, he mentioned that he had once been deployed to Korea himself, so he understood her situation. After the interview, he rushed her case so she could take the oath ceremony the same day. She was the last person to walk in.
So if they don’t let you in, demand to speak with a supervisor. Good luck!