Hey this is weird. Last night I pre-ordered the Left Behind DLC through best buy and they sent me my code around 1am eastern standard time.
I've been trying to add it since then through both my ps3 and the playstation store website and I keep getting this:
I called Best Buy and they said they'd email me another code within 24 hours but if you're experiencing it as well...hopefully all the 3rd party suppliers codes aren't faulty.
EDIT: Wait, nevermind my code just worked. I guess they just activated them? This is weird man.