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your second human task has no assignments (neither actors nor groups). Swimlane will be able to auto assign only if user from first task has access to the subsequent tasks on that lane - that means it must be one of potential owners of these tasks. So make sure you assign that user either directly (ac ActorId) or via group. For actorid you can specify multiple actors otherwise it will be assigned to it anyway. Actually best is to rely on group assignment and make sure that given user is member of that group.