Please check the screen of the Soehnle fitness tracker you are using. Enter the PIN CODE (six-digit number) displayed there when requested by the app. If you do not see a PIN CODE or do not have a Soehnle or other fitness tracker, turn off the Bluetooth function on your smartphone and, if necessary, activate aeroplane mode to prevent anyone from connecting to your smartphone. Although the question about entering a PIN CODE may be displayed in the Soehnle Connect app, it is managed by the operating system of the smartphone. Soehnle Connect has no influence on this.