What's the context?
Maybe you're getting a message that says a WikiTree ID is redirected, and therefore can't be merged?
This is an error that will come up when trying to complete a merge that has already been completed.
When one profile is merged into another, the merged-away ID is "redirected" to the merged-into ID. For example, if Jones-1 is merged into Jones-2, Jones-1 becomes a redirected ID. If anyone tries to go to Jones-1 they will be redirected to Jones-2.
Not sure if that answers your question. Explain more of what you're seeing if not.
