Code to download PS4 client is not yet valid

[Valan]

I did the PS3-PS4 upgrade yesterday, was provided with a 12 digit code from the Mog Station to download the client, but the PlayStation Store rejected my code with the unhelpfully vague suggestion that the code is either incorrect, already used, invalid, or not yet valid.

Same for me, but in the Lodestone there is no indication about a time of validity.