I have copied the email they sent me below. I was able to see the green check marks and having reset OneDrive it didn't restart so I had to run the final task. Then all was and still is well.
- Are you able to see the green check marks on all the files/folders in OneDrive folder of file explorer?
Try resetting your OneDrive in windows 10 computer:-
- Press the Windows key + R.
- In the Run window, enter: %localappdata%\Microsoft\OneDrive\onedrive.exe /reset
- Click OK.
- Make sure the OneDrive icon in the notification area of the taskbar disappears and then re-appears after a minute or two. Here’s how to check: Right-click the white OneDrive cloud icon in the notification area, at the far right of the taskbar.

(You might need to click the Show hidden icons arrow next to the notification area to see the
OneDrive icon.)
- If the OneDrive icon doesn’t re-appear after a few minutes, open the Run window again and enter: %localappdata%\Microsoft\OneDrive\onedrive.exe