You will need to get in touch with Sky Store support about this so they can change your account to a Sky only one, they have a live chat you can use that is available from 11am-7.30pm Monday to Saturday and can be found here:
https://www.skystore.com/help/contact-us
The one thing to point out is that you will only be able to use Sky Store apps on tablets and phones and the inbuilt one on a LG TV as well as the Sky Store website.
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