OneDrive prompting user to login when saving from Office

Issue: The user gets a prompt that asks them to sign in when trying to save a file from Word or Excel directly into OneDrive when they are obviously already signed in.

Cause: This issue is caused by any of several scenarios:

1. The user's Office 365 account password changed and for some reason did not sync properly with Office
2. The user had the older version of OneDrive (OneDrive For Business) installed on their computer and the upgrade did not completely remove the old version
3. The user has failed uploads in their upload center
4. The OneDrive Cache needs to be cleared on.

Resolution: Follow these steps in order to correct the issue:

1. Open an Office program (Word or Excel), go to File > Account > Sign Out
2. Find the Microsoft Upload Center either in the system tray or in the Start Menu. Go to Settings and change these settings:

1. Go to the Control Panel > Credential Manager  > Windows Credentials and delete any credentials that say MicrosoftOffice16_Data: or MicrosoftOffice15_Data: and OneDrive For Business
2. Download the program from Microsoft  here and run it. 
3. Once it opens, click Next > Yes > Next  > Yes and let the program finish.
4. Open Excel or Word again, go to File > Account and have the user sign back in. 
5. Try to open and save a document to OneDrive, it should now work.