Why Can You Not Use The OneDrive App While Signed In Using A Local Account?

You cannot use the OneDrive app while signed in with a local account because OneDrive requires a Microsoft account for full functionality, including cloud synchronization and storage services. A Microsoft account provides the necessary authentication and integration with other Microsoft services. Local accounts lack these capabilities, making it impossible to access OneDrive features properly. For OneDrive to work, you must sign in with a Microsoft account.