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Maybe this is the issue? From: Replicas.
You can create a new global table with as many replicas as needed. You can add or remove replicas after table creation, but you can only add or remove a single replica in each update.

This doesn't help, I manually create a single replica, but still pop out the same error saying one or more replicas already existed. I guest there might be some cache on DDB's server? any clue?