Tap ID without invitation

I am trying to use Touch ID to authenticate a login in an enterprise app. I was hoping the user would only pop up by default once and then just add a label for any subsequent logins. Use Touch ID or Enter PIN (the way apple does it with a passcode). Does anyone know how to suppress the dialog that comes up using the "evaluationPolicy" function? I've seen other apps do this too, so it should be possible.

[localAuthenticationContext evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:localizedReasonString reply:^(BOOL success, NSError *error) {
    if (success)
    {
        // continue to app
        NSLog(@"SUCCEED!!!");
    }
    else
    {
        // go back to full login
        NSLog(@"error : %@", [error description]);
        errorCode(code);
        NSLog(@"FAILED!!!");
    }
}];