Sync directory on Windows laptop with NAS, multiple laptop users

I’m a happy Syncthing user, works great! Now I’m facing a new challenge, didn’t manage to solve it yet:

I want to synchronise a fixed directory (say, c:\workfiles) on our company laptops with a directory on our NAS.

That works perfectly for one user per laptop. Now I’ve multiple users who use the same laptop for working at home. They all use the same folder (c:\workfiles) but use their own login credentials. I’ve installed Syncthing as administrator, running from scheduled task even when administrator is not logged in. It works for the administrator but not for my colleagues. In their case Syncthing simply doesn’t connect to the NAS.

What can I do or change?