Using New Outlook on Windows for personal email, calendar, and contact management
It seems that Microsoft has implemented changes regarding account access, particularly with the introduction of passkeys for signing in. If you are unable to log into your Microsoft Outlook account without a passkey, it may be due to the requirement for enhanced security measures that necessitate the use of a passkey or biometric authentication. This is part of Microsoft's ongoing efforts to improve security for user accounts.
If you previously had alternative sign-in methods, you may want to check if those options are still available or if there have been any changes to your account settings that now require a passkey. You can also try signing in using different methods if prompted, such as entering your username and selecting other sign-in options.
If you continue to face issues, consider reaching out to Microsoft support for assistance with your account access.