Hi,
Based on my research, to block users from signing in with a Microsoft account to sync their personal OneDrive files, we can set the following registry key:
[HKCU\SOFTWARE\Policies\Microsoft\OneDrive]"DisablePersonalSync"="dword:00000001"
Here are some links for the reference:
https://learn.microsoft.com/en-us/onedrive/use-group-policy#prevent-users-from-syncing-personal-onedrive-accounts
https://answers.microsoft.com/en-us/msoffice/forum/all/disable-personal-onedrive/694fc7af-34c7-4f80-9d62-5fca1c411ac9
Check in administrative Template device configuration profile and other profile, find the setting is not there. If we want to set the registry key via Intune, we can try to write a script to accomplish this:
Due to block users to pause OneDrive sync:, I don't find such setting.
Hope it can help.