@Handian Sudianto, Thanks for posting in Q&A. Based as I know, Administrative shares can be accessed by members of the computer’s local Administrators Administrators group. For Autopilot enrolled deice, the built administrator account will be disabled due to security reason. So it is unable to access via this account.
But the global administrator will be added to Microsoft Entra joined device, when it joins to Microsoft Entra. You can try this account to access the admin shares to see if it can work. Or if there's any other local admin account on the device, you can also use it.
In addition, if you want to add new local admin into local administrators group in bulk, you can try Local user group membership policy in Intune. Here is a link with more details for the reference:
Hope the above information can help.
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