user_error
The most common kind of error, this indicates that the user has failed to select an institution, or has failed to authenticate with that institution, or has abandoned the linking process for so long that it has timed out and failed for lack of action by the user.
incomplete
This indicates the link is partially complete, but is waiting on some form of user interaction, such as granting permissions or accepting terms. An incomplete link can be completed in a later session; it will not “time out” or enter another error state automatically. However, it cannot be used to get data while in the incomplete state.