Integrating MSAL in iOS App, Sign in with Apple?

I have to integrate Microsoft Authentication Library (MSAL) in my app, am I violating section 4.8 of Apple Review Guidelines? Should I implement sign in with Apple? I’m not sure, it is a third party login but also:

Your app is an education, enterprise, or business app that requires the user to sign in with an existing education or enterprise account.

Thanks for your help

Replies

If you manage existing accounts for users such as education accounts or enterprise accounts. For example if you are a university that distributes accounts for students and want them to use the app only if they authenticate with the university account. Then it's OK to not implement Sign In with Apple.

However, if you use MSAL to authenticate personal accounts ending with @outlook.com or similar, while the user have the ability to register an account using your own UI with an email and password, then I guess this makes MSAL the same as any other 3rd party authenticator and you have to provide Sign In with Apple as well.