I have just received an email with a campaign code in it - no mention of which of my two accounts it's for, but keeping Murphy's Law in mind one would assume it'll probably be for my mule's POL ID. Once I'm done re-installing and applying updates, I simply can't wait to see if it actually works. I mean, what're the odds? :P
EDIT: fwiw, you don't need the game installed to redeem the code. You can log in to the account site, enter the code, and choose which POL to apply it to. Totally sensible design decision, I'm literally in shock.