EMERGENCY: Name Change Request for PL-300 Exam in 24 Hours - Mononymous Candidate

Hello, I have my PL-300 exam scheduled in less than 24 hours. I am a mononymous candidate with only a single legal name (Deepak). The registration form required a last name, so I used the filler letter "K". I need to change my last name to a period (. or _) so it complies with Pearson VUE single-name policy and matches my ID. Pearson VUE told me only Microsoft can change it. Please open a private message so I can share my details. Thank you.