No. Newly registered domains must be manually added to the hosting system via the panel at Domains -< Manage Domains -> Add New Domain/Sub-Domain
It sounds like the domain has previously been added to the DreamHost system, if not by you, then by someone else. I suggest you lodge a support request via the panel detailing the situation, they should be able to remove the domain from their system, allowing you to add it under your account.
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