Thanks for your post and welcome to the forums. It's great having you on board with us in the Community.
I'm sorry to hear you are having this error when trying to watch Sky Sports content. Your TV Go and Sky devices are separate so need to be managed as such.
To make a change to your registered Sky devices:
- Go to the Virgin TV Go website
- Select Settings and then Device Management
- Sign in using your primary My Virgin Media username and password if prompted
- Select on Manage my Sky Devices
- Choose the device you want to remove and select Delete
The next time you access the Sky Sports app with a new device it will automatically register for access to streaming.
Let us know how things go and if you need anything else, you know where we are.