@Sebastian H, Thanks for posting in Q&A. For the Intune Admin Center, based as i know, Azure AD user can login but can't view much information. In Intune, there are some built-in roles with specific permission you can assign to users to let them to manage Intune or you can create custom role according to your requirement. Here is a link with more details for the reference:
https://learn.microsoft.com/en-us/mem/intune/fundamentals/role-based-access-control#built-in-roles
Hope it can help.
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