If it says it is already linked then you are using the correct login details with the app as this should be your main Sky ID. If you are sure you are then you will have to contact Sky for help:
You can contact Sky via social media:
https://helpforum.sky.com/t5/Online-Apps-Email/Want-to-private-message-Sky/ba-p/4895295
Or via the phone 150 is the free number to use from a phone that has a Sky mobile sim in it or Sky Talk phone otherwise under "Need more help ?" link at the bottom of the page on this link is the number to call Sky on:
https://www.sky.com/help/home
Try saying nothing when spoken to by the bot.
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