Hi @Ben Wilson
Thank you for posting your query on Microsoft Q&A.
I understand that your non-admin user can still access to "All Devices" page even though in user permission "Restrict access to Microsoft Entra administration portal" is enabled to Yes.
Non-admin users cannot view the device page since they have access restrictions to the Microsoft Entra administrative site, which I tested in my lab as well. It's possible that the user you're working with was assigned any custom role.
Don't use this switch as a security measure. Instead, create a Conditional Access policy that targets Windows Azure Service Management API that blocks Non administrators access to Windows Azure Service Management APIl.
Follow the document for more information: https://learn.microsoft.com/en-us/entra/fundamentals/users-default-permissions#restrict-member-users-default-permissions
Hope this helps. Do let us know if you any further queries.
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Thanks,
B. Siri Chandana.