I am repeating myself from another thread but I'm 90% sure of the answer and no-one checks: are you sure OneDrive works well? Can you sync PST files? [1]
[1] https://www.eejournal.com/article/onedrive-down-the-road-to-...
[1] https://www.eejournal.com/article/onedrive-down-the-road-to-...