@Tafkak Are you signed into your My Sky account at www.sky.com If not you will not be able to enter your activation code.
Once logged in go to https://www.sky.com/productsettings/streaming-tv/activate and input the code.
If that doesn't work and you are still getting the error message you will need to give Sky a call. Alternatively, if you prefer, you can post back here and I will escalate your issue to the Community Messaging Team for them to invite you to an online chat.
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