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This documentation may helps:
Users can self-enroll their Windows device by using any of these methods:
- Bring your own device (BYOD): Users enroll their personally owned devices by downloading and installing the Company Portal App. This process:
If an administrator has configured Auto enrollment (available with Azure AD premium subscriptions), the user only has to enter their credentials once. Otherwise, they'll have to enroll separately through MDM only enrollment and reenter their credentials.
- Registers the device with Azure Active Directory to gain access to corporate resource like email.
- Enrolls the device in Intune as a personal owned device (BYOD).
- MDM only enrollment lets users enroll an existing Workgroup, Active Directory, or Azure Active directory joined PC into Intune. Users enroll from Settings on the existing Windows PC. This enrollment method isn't recommended because:
- It doesn't register the device into Azure Active Directory (AD). Users might not get access to organization resources, such as email.
- It prevents using some Azure AD features, such as Conditional Access.
Source: https://learn.microsoft.com/en-us/mem/intune/enrollment/windows-enrollment-methods
Hope this helps!
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