Hi i have 2 devices registered i can watch tv fine on my phone but when my son uses it he gets error code d 1. I have checked login details and they are the same on both. It worked fine when he had his tablet registered.
Welcome to the Community, I'm really sorry to learn about the problems you're experiencing with your TV Anywhere service lately.
Are you able to remove and reinstall the application on your sons device? What device is he using too? If he's using a browser than it might be auto filling the login and password with previous details.
Look forward to hearing from you and getting this resolved.