Even when one is onsite and changing their password at their workplace, I have seen OneDrive can be quite finicky with password changes, sadly. Essentially, when working from home or offsite, sometimes errors may have occurred for OneDrive or over VPN. An EE Community member I assisted had an unusual issue, see ( Upload to OneDrive for Business failed, this was noticed after a password change | OneDrive for Business | EE ) for more details.
The web version can come in handy, especially if you've deleted files from OneDrive and need to see if they are present for recovery or are concerned about whether recent files were saved or uploaded successfully.
It applies primarily to Windows OS workstations however, some tips can address Mac OS X workstations errors. I will walk you through common scenarios I have seen based on my experience on a walk-up TechBar and the most common situations that I have helped fellow members in our EE Community resolve thus far.
This article is a comprehensive guide on troubleshooting some of the most basic OneDrive for Business sync errors or how to tackle when the file sync stops working overall.