The API is returning a 403 (Forbidden) error when making a call from our iOS app with a work/business account to https://www.onenote.com/api/v1.0/me/notes/notebooks
The account being used is the administrator, the access token was properly generated using the ADAL library, the two-factor authentication is turned off and the app has the proper access in app permissions.
Is there any other reason for this error to happen?
Any pointers/help would be appreciated.