Preventing users from carrying out AAD device registration
To block your users from adding additional work accounts to your corporate domain-joined, AAD-joined, or HAADJ Windows 10 devices, enable the following registry key. This policy can also be used to block domain-joined machines from inadvertently getting AAD registered with the same user account: HKLM\SOFTWARE\Policies\Microsoft\Windows\WorkplaceJoin, "BlockAADWorkplaceJoin"=dword:00000001
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There is no central way to prevent a user from registering their BYOD device in AAD. If AAD automatic MDM enrollment is configured and the checkmark for Allow my organization to manage my device is set, the device will be enrolled into Microsoft Intune. Next, we will take a look at self-service password reset (SSPR).