Good morning, Kevin,
For the application, PMI takes a very broad view of "project management" It does not focus on the method - only that (a) what you did wass a project and (b) you managed it. The application is blind to the methodology that you followed - only that you can demonstrate that you actively managed the project.
For the exam, I don't believe that your singular method (agile) will have any impact - once you get comfortable with how PMI expects you to manage projects! I started my PMP journey and learning the language of project management was like learning a foreign language, until I got used to it and things started clicking for me. Take a prep course (I did) and enroll in a high quality exam simulator and use it until you get comfortable with how questions are asked and what the expected (or "right") answers are. You will hear it said a lot that the you must answer the questions on the exam the way that PMI expects you manage projects - not the way you, personally, do. Once you get that drilled into you, you'll be much better off.
Good luck in your journey!