Can you please give that a try and let us know if this helps?
With the TV Anywhere service you can have up to 2 devices registered each month. You can refresh the devices on the 1st of each month if you wish to change them. To find out more supporting information about that then please check out our handy help articles Introducing Virgin TV Anywhere.
If the issue is with your log in for My Virgin Media then this may need to be looked at by our Care team for you either via Webchatto ensure these details are up to date for you, or speak to the teams on 0345 454 1111/ 150.