Problems with Twitch on FireTV Stick?

Hi Guys,

I switched off the TV earlier and wanted to open Twitch. But then suddenly this window appeared.

Does anyone know what the problem is here and what I have to do? I would very much appreciate a positive feedback.

"Fire TV Stick: Set up the Twitch app

As soon as the Twitch app is installed, you can start the individual streams. If you already have a Twitch account, you can also set one up on the Fire TV Stick.

Open the Twitch app and select the "Register" menu item at the bottom.
Now open the http://twitch.tv/...v/activate website on another device (e.g. Your smartphone).
Enter the six-digit code that will be displayed on your television.
After a few seconds you will be logged into the Twitch app and can access your subscriptions. "

Did you follow these steps?