That's why almost all online services - banks, social media, shopping and yes, Microsoft 365 too - have added a way for your accounts to be more secure. You may hear it called "Two-Step Verification" or "Multifactor Authentication" but the good ones all operate off the same principle.

Allow the troubleshooter to run and then answer any questions on the screen. If you see a message that no changes or updates were necessary, you can try recovery options, or find out more about Outlook error codes and upgrade and installation error codes. Windows 8.1 and Windows 8.