Not the VP’s job. Per the Constitution the states are responsible for running their elections and answering those questions before certifying the electors.< p>It isn’t up to the feds to tell the states how to choose their electors.
Except that the Constitution seems to contain no mechanism to force a VP who’s had a snootful of systemic, concerted frsud across multiple states and is determined to, at least, throw each of the offending states onto its back foot, simultaneously and with an intention to smoke out people with “pan-state” influence who coordinated the electiral fraud above the level of any one state, even if the state-level actors remain hidden for the time being. This would amount to a Constitutional crisis, yes, but not created by the VP, merely discovered by the VP.