Clear cached Microsoft Live account credentials in Office apps
Open the registry editor, RegEdit, and search for the username you want to log out. You may find it in a folder here:
Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity\Identities
Delete the folder and the next time you attempt to access the OneDrive files you will be prompted for credentials. You may want to tweak the value of the "Persisted" field. I found mine was set to 1.