@Guljeet Welcome to the forum. I know you haven't asked for it but I will outline all you need to know for the puck setup including the activation.
To set up the Stream puck just connect it to your TV with the included HDMI cable and follow the on screen instructions where you will be asked to pair the remote, connect to your wi-fi and activate the puck. During the setup procedure you will be asked for a PIN number. By default this is the last 4 numbers of your phone number registered to your Sky account.
During setup you must also be using the same email that is registered to your account.
When you get the activation code on screen you need to sign into your My Sky account at https://www.sky.com/mysky
Once logged in go to https://www.sky.com/productsettings/streaming-tv/activate This is where you can enter your activation code. NB is you are not logged into your MySky account you will receive an Oops... error message.
The following is a link to a very short Sky video on the setup procedure:
https://www.youtube.com/watch?v=oxVeo8adcnQ
Hopefully you wont need it but the following link takes you to some basic help files if you encounter any problems: https://www.sky.com/help/articles/setting-up-sky-glass-help
Good luck 🤞
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