A Microsoft file hosting and synchronization service.
Hi Colby Parker
Good day! Thank you for posting to Microsoft Community. We are happy to assist you.
I am truly sorry for the inconvenience this issue has caused you. Based on the description, I understand that you are unable to sign-in to your school OneDrive account on iPhone due the Authenticate App.
Since your query is regarding the Microsoft Authenticator app, we have a separate community team, so it is recommended to post through Microsoft Authenticator - Microsoft Q&A so that a support agent from that team can verify and provide you with the necessary information.
Your understanding and cooperation are greatly appreciated.
Sincerely,
Roger Shen