Bought age of empires 3 on steam - get an e error "unable to create account 100 – Bad CD key" would you guys help me?

I had exactly the same problem and I also contacted Microsoft and Steam. Why is nobody responsible for this game ?!?!
I hope they are going to solve it soon!

I kind of found a “solution”. I bought a hard copy of Age of Empire 3 in a store and the CD-Key worked with Age of Empire 3: Complete Collection bought on Steam. I was able to create an ESO account.

The original problem isn’t solved and I bought the game twice, but at least I get to played online with my friend…

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This should be resolved now.