@JaneufyYou should be able to register as follows:
Go to the bottom of the home page and select the following in this order: MySky / your products / (enter your PIN) / App Subscriptions
Select App subscriptions / Current / and then Discovery + Monthly. Hopefully it will say something like £0 per month as you are subscribed to Sky. If so select Activate subscription.
Also, see the following link:
https://www.sky.com/help/articles/discovery-plus-homepage
Good luck 🤞
Moderator note: Updated link
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