Hi,
Thank you for posting in Microsoft Q&A forum.
Similar thread for your reference:
https://learn.microsoft.com/en-us/answers/questions/1191087/azure-mddprov-to-intune-question?page=1#answer-1189493
If both MDM and MAM user scope both are enabled for all users (or the same groups of users), please try to turn off MAM user scope, delete the device from Azure AD, disconnect the account on the device, then connect it again, and join to Azure AD and enroll to Intune.
Because for Windows BYOD devices, the MAM user scope takes precedence than MDM scope, so the device will not be MDM enrolled and not be visible in Intune.
Thanks for your time. Have a nice day!
Best regards,
Simon
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