@Sabur Mirza, Thanks for posting in Q&A.
From your description, we understand that you just want a certain group to be enrolled in Intune, but when you set MDM user scope "Some" and try to enroll the device in that group, the device does not enroll, and when you set MDM user scope "All", the device does enroll.
From your description, we add device group under some. But as I know, when you set MDM user scope "Some", you should select a user group to assign not a device group.
For more information about MDM user scope settings you can visit the link below:
Enable MDM automatic enrollment for Windows | Microsoft Learn
Please change the group with the enrolled user include and see if it works. Hope above can be helpful!
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