Hello @Jason Rodriguez •
I understand that your application needs to log in via https://login.microsoftonline.com/ to retrieve information for synchronization (users/groups). Since the user used to initialize the synchronization is not permitted to sync as a user for federated authentication. Now, you need to know the appropriate user or service account that can log in via https://login.microsoftonline.com/ and be granted the necessary access for user synchronization.
As you mentioned federated authentication, could you clarify where you are expecting this to be implemented? Additionally, since you indicated that you are unable to sync a user with federated authentication, could you specify which synchronization process you are referring to?
If you have any further questions, feel free to reach out. We are happy to assist you further.