Onedrive personal vault problems

The red X indicates a synchronization problem, but it does not establish that your Personal Vault files have disappeared. First sign in to your personal OneDrive through a browser and check whether the vault unlocks there. Preserve any local files that have not synchronized before changing the desktop setup. If browser access works, restart OneDrive, then consider Microsoft's reset procedure. Press Windows+R and run %localappdata%\Microsoft\OneDrive\onedrive.exe /reset. If Windows cannot find that executable, use the installed OneDrive location specified in Microsoft's instructions. Start OneDrive again afterwards. Resetting does not delete your files, but it resets sync connections and triggers synchronization again. Review your previously selected sync folders afterwards. The installer warning means you should not force an older package over the newer installation. If the vault also fails in the browser, record that error separately and contact Microsoft support; reinstalling the desktop client would not establish the cause of that failure.