3705207 - Why am I receiving Task cannot be started even though its predecessors have been completed notification if registration approval has been completed?

Why am I receiving Task cannot be started even though its predecessors have been completed notification if registration approval has been completed?

email notification, supplier registration update, task cannot be started, notification profile, sap ariba, approval task, questionnaire update, unsupported notification task, external questionnaire, project email templates, sap ariba supplier lifecycle and performance, predecessors , KBA , BNS-ARI-SLP-REG-NOT , Email Notifications , Problem