@Simonetti, Louis (LG),Thanks for posting in Q&A. From your description, I know you want to request the feature to manage the Login Screen on MacOS to be redirected to Azure AD login which Intune currently didn't have. Here, I suggest go to Intune uservoice to feedback. And hope we can see this new feature in the future:
https://feedbackportal.microsoft.com/feedback/forum/ef1d6d38-fd1b-ec11-b6e7-0022481f8472
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