A Microsoft app for iOS and Android devices that enables authentication with two-factor verification, phone sign-in, and code generation
It seems like you want to change the passcode length in Microsoft Authenticator from 8 digits to 6 digits. However, Microsoft Authenticator typically uses 6-digit codes by default for most services.
If you are seeing 8-digit codes, it might be specific to the service you are using. Check the settings of the service you are connecting to Microsoft Authenticator and see if there is an option to change the passcode length.
If you need more specific guidance, please provide additional details about the service or account you are using with Microsoft Authenticator.