Microsoft is taking online safety to the next level! With the newly rolled out Passwordless UX in Microsoft accounts, users can have a more secure way of signing in.
The passwordless UX will be available to new Microsoft accounts. News users have the option to use an authenticator app or a passkey to sign in instead of enrolling a password. They can sign in using facial recognition or fingerprints.
But, no matter how promising it works, there are also imperfections that prevent users from continuing forward. This includes the common not working issue when using the Passwordless UX.
Possible Fixes for Passwordless UX Login Not Working Issue in Microsoft Account

Can we really troubleshoot a faulty passwordless UX in Microsoft? Let’s dive into some potential solutions to resolve the error.
Are you using an authenticator app? If so, have you enabled the sign-in option? Not enabling it will only result in issues. Enabling it will also register your device in Azure AD.
Another possible way is to disable passwordless sign in and then enable it again. It will help refresh the sign in process.
Also, take note of the prerequisites to use the password sign-in via authenticator. Check out this link to view the prerequisites from Microsoft.
You can also try deleting your Microsoft account on your authenticator and adding it again. But, see to it that your passwordless sign-in is not enabled when doing so.
Refresh your app settings by clearing the authenticator app cache. It helps in keeping your processes running smoothly.
Conclusion
The passwordless sign in helps in preventing attacks on your passwords. Try the tips above if it is not working for you. If none of the above works, you can also contact Microsoft support for assistance.