How can I change the setting of “Microsodt Authentification”?

Hello TAEWOO KIM,

Thanks for your question.

1. Turn off 2 factor verification on any account that will allow you to do this.
2. For a Microsoft account:

The confusion comes in when you add the Authenticator App to your MS account. There is an option to use 3rd party compatible QR codes. If you select that you will get a 6 digit TOTP vice 8 digit TOTP.

3. Turn two step verification on or off for a Microsoft account

https://support.microsoft.com/en-us/account-billing/how-to-use-two-step-verification-with-your-microsoft-account-c7910146-672f-01e9-50a0-93b4585e7eb4 

4. For other accounts see if the code can be sent to an email account, not a mobile phone

See citation answer here:

https://answers.microsoft.com/en-us/windows/forum/all/why-does-microsoft-authenticator-give-you-8-digit/f9c3c580-aa81-48a8-901a-88cd94839d07

You can mark it 'Accept Answer' if this helped.

Regards,

Abiola