A Microsoft file hosting and synchronization service.
Hello, thank you for reaching out.
May I please know whether you are experiencing this issue in both the OneDrive desktop app and OneDrive Online through a web browser?
Open an incognito or private browsing window in any web browser.
Sign in to your Microsoft account here: https://onedrive.live.com/
In the left pane, go to My Files and check whether the Personal Vault folder appears in the list of folders on the right.
Double-click the Personal Vault folder to access it.
If you can see the Personal Vault folder online but not in the OneDrive desktop app, try resetting OneDrive by following the steps in this article:
If resetting OneDrive does not resolve the issue, uninstall and reinstall OneDrive.
During setup after reinstalling, make sure you avoid syncing folders initially. Once the Personal Vault folder appears in your OneDrive desktop folder list, you can turn syncing back on.
Let me know if you still need more help.