i download Conan unchained though steam and had made account the official site but my login does not work on client
It’s possible you have a different password for the game than your password for the account page. But if you think it’s the same, I would try changing the game password anyway.
I would suggest after the steam download, make your account, roll your character first with the game client, then register the account through the funcom link. In the store, click add funcom points, you don’t have to, but should give you the link to register. Hope that helps.