You can only invite the vampire in if you’re inside the house. If the judge signed the warrant while inside the house for some reason, the vampire could enter. But in the usual case where they were anywhere else, it wouldn’t count.

I suspect that for people who spend a large amount of time in the house, the quality of “inside-ness” rubs off on them: you can probably text your vampire friend the location of your spare key and ask them to check on your cat, even if you’re not there. But someone who has never been inside can’t reasonably offer an “invitation.”