To see what is left to pay go to your "My Payments" section here:
https://www.sky.com/myaccount/mobile/device/x/payments
If you are seeing an unauthorised message then have you both linked your account as per this:
https://www.sky.com/help/articles/link-a-sky-id-to-your-sky-mobile-account
Or are you signed in with the correct Sky ID ?
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