Where can I find the code?

I have an Xbox 360 and want to connect it to the Xbox Companion app. I just need a code and I don't know where to find it

Does anyone know?

The Xbox app does not work 90% of the time with the Xbox 360. All the features included in the Xbox app are intended for the Xbox One and Xbox Series. Only the messages work with the 360. So when you send someone a message, they can read it on the 360 and reply to you. Since the message system on the Xbox 360 is a bit older, it will not look like the one on the Xbox One / Series, Android and Windows app, such as the look of a messenger such as Whatsapp or Telegram.