I encountered this, as a non Ubisoft playing person I bought Anno1800 and had to create myself a new Ubisoft account.
After the main account creation process (account creation, email verification. etc) it immediately was prompting me to enter a CDkey which i did not have through steam and there was no way to proceed without that.
All that I had to do was cancel out of that screen and relaunch and steam connected to the newly created account and moved past that step.
So if its prompting you for a code just cancel and relaunch and you should be good to go.
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