Thanks for the post Crusher70 and welcome to our community.
So this would create another My Virgin Media account for the mobile aspect of the bundle, if you're not aware of the memorable word of this it may be the same as the media account as it's copied across when this is created, could you please try this?
If you still need help after this we just need to confirm if you're the account holder on the account as well please?
Thanks, Emily.