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Hi Keln(1),
If you would like to use GPO to push the sync process to users automatically, it’s not possible to achieve that. Users should sign in to OneDrive client with their Office 365 work or school accounts to complete syncing by themselves.
In addition, In your scenario, we suggest you use SharePoint libraries for syncing shared folders because we cannot sync other users’ OneDrive for Business libraries.
Thanks,
Rena