Well, THAT was odd. I had the same problem as well, after having reset my MSOutlook account password. DESPITE having re-logged in (successfully) several times, I found that upon entering 'OneDrive,' ALL my OneDrive files were no longer present/visible, and I received the above-noted error message "Something went wrong. Error code: 103."
Though I was able to re-login to my Outlook account afresh and remained able to view my emails and other Outlook-related features, my OneDrive files *appeared* to be gone.
BUT ... after giving up trying to regain access late in the evening, I found the next morning that upon again re-entering my account, suddenly they had all re-appeared. Perhaps there was some delay factor at work, that prevented access for a time?