This error is returned when the credentials provided by the user to Link are invalid. It is also returned when the user's credentials were previously valid but have since changed — for example, after the user changed their password at their institution.
Recovery
INVALID_CREDENTIALS is returned live within the Link session the user is already in — there is no separate broken Item to fix afterward with update mode. For the full list of common causes and troubleshooting steps, see INVALID_CREDENTIALS in the Item errors reference.