OneDrive sync without user logging in.

Has anyone figured this out?

We have an un-manned server that has NGSC installed. What we are trying to achieve is have a script copy the files to the synced location twice a day, and have external vendors access that sharepoint site.

We are seeing issues with the sync stopping/ not working unless a user logs in to the server. 

Groove.exe used to work as we had a script that manually invoked groove.exe and the sync ran. 

Any help/ thoughts?