RESOLVED: The team is aware that players logging in through a Facebook account are currently unable to log into Sky, and we're investigating the cause of the issue.

Please note that players should still be able to access Sky through other login means if they have linked their Sky account to another external account such as Google, Game Center, their Apple ID, etc. For more information on linking to other accounts while logged into Sky, please refer to this article:

Thank you for your patience while we work to resolve the issue!