Taken from here:
https://helpforum.sky.com/t5/Sky-TV/Error-Codes-on-Sky-Q-and-Glass/ba-p/4017045
It seems to come from using Disney Plus on your mobile or using mobile data, such as a hotspot or your data plan, or Roku devices. It could also be if you had previously another account logged onto the sky box.
Log in using the original email address that is linked to the account holder. Disney will say you are no longer subscribed and tto log out. When you log out and then log back in with the new account, it should work fine.
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