Hi @Anonymous User,
Thanks for getting in touch with us here at NOW TV.
Sorry to hear about the issues you have encountered on your Xbox.
Can you please try signing into NOW TV through the Xbox browser and then try to sign in and play out on the app.
If you still encounter this issue, can you please sign into your Router through the Xbox Browser and then sign out and try to play out again.
Please let us know how you get on.
NOW TV Team