Why would Review Center charts show "Unknown User 1" for some coded documents?

The correct answer is B. A reviewer was originally part of the workspace and coded documents, but has since been removed from the workspace. Relativity’s official Review Center documentation explains that when documents were coded by reviewers who are not part of the current Relativity instance , those reviewers can appear in charts and tables as “Unknown User 1,” “Unknown User 2,” and so on. The documentation specifically notes that this can happen if a reviewer was removed from the workspace or if the workspace was archived and restored into a different instance. That directly supports option B.

The other options do not match Relativity’s documented explanation. Losing permission to code is not the stated reason for the “Unknown User” label. Likewise, an unprepared project is a separate project-state issue and does not explain why specific prior coding activity would be attributed to an anonymous placeholder. An error requiring queue re-preparation is also not the documented cause of this naming behavior. From a case administration perspective, this is an important concept because administrators often manage workspace users, permissions, and lifecycle changes over time. If prior reviewers are removed, their historical coding may still appear in analytics or project monitoring views, but the user identity may no longer resolve normally. In that circumstance, Review Center surfaces those coding records under a label such as “Unknown User 1.”