Hi,
Thank you for posting in Microsoft Q&A forum.
1,Agree with JM. We can use Intune to stop syncing personal accounts on OneDrive. Go to Configuration Profiles -> Create profile -> Windows 10 -> Administrative Templates -> User Configuration -> Prevent users from syncing personal OneDrive accounts. As shown below.
2,Or you can deploy below related registry key from Intune.
HKEY_CURRENT_USER\SOFTWARE\Policies\Microsoft\OneDrive\DisablePersonalSync key. It's DWORD value should be 1.
Similar threads for your reference:
How to Prevent Users from Adding there Personal Microsoft OneDrive
OneDrive: Prevent Users From Syncing Personal Accounts
Prevent users from syncing personal OneDrive accounts
Thanks for your time. Have a nice day!
Best regards,
Simon
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