Firstly, can you confirm which box you have - you've posted in the TiVo board but mentioned a V6...
https://www.virginmedia.com/help/virgin-tv-pairing-tv-remote gives advice on pairing the remote, as well as checking which box you have,
The V6 needs a separate internet connection whereas the TiVo has it inbuilt, and if the box hasn't downloaded its latest software drop, that could potentially be an issue.
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