@ShreyasHA you can always check enrollment errors for more details. Easiest way si through "Troubleshooting" section in Intune portal. Just select user you used for enrollment and it should show you errors.
It might not be the same problem, but I was receiving the same error recently when enrolling iOS devices. It turns out the user account hit the device limit in Azure AD. I found out that devices in Azure AD aren't the same as devices in Intune. Same with the device limits. Try checking the device limits you have in Azure AD and also any devices in Azure AD for the users with the problem.