16 character CD key not working for D2

My 16 character CD key for D2 is not working to authenticate my digital copy, which says it requires a 26 character key. Anyone else encounter this and how to fix?
Thanks!

you have to register it on bnet in order to get a 26 digit key

And if that key/s has already been registered/claimed you have to buy new cd keys

I just bought D2 online and downloaded it and got my cd key 26 digit and it keeps saying im typing it in wrong. but i checked a thousand times over and its what they gave me??? what do i do? could it be because the paypal transaction is still pending? if so why give me the key code?

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