For TM6 there is no need for this since the Cook-Key® has been eliminated. The TM6 has an integrated WiFi module that allows easier, more efficient, seamingless communication with the internet.
For TM5 registering your Cook-key® in the Thermomix® Cookidoo® recipe portal is no problem. After signing in to Cookidoo®, you activate the Cook-key® in your user profile using its serial number.
Every serial number is unique. The connection between the Thermomix® recipe portal and the Cook-key® will only work by entering the correct serial number.
Alternatively, you can also activate your Cook-key® via the iOs or Android apps.