Debugging eventbridge events from aws transfer

Question

I want to trigger a lambda on SFTPConnectorDirectoryListingCompleted coming from aws.transfer. The doc claims that Transfer will deliver events to the default bus. However, from the console, I cannot see any such events by monitoring the default bus.

I've written a rule to trigger a lambda, but until an event actually happens, clearly it's not going to do anything. I provide it here just to give some context on what I'm up to.

 const triggerStartCopiesEventRule = new events.Rule(this, "TriggerStartCopiesRule", {
 description: "Trigger the start-copies lambda",
 ruleName: "TriggerStartCopiesRule",
 eventBus: defaultEventBus,
 eventPattern: {
 source: ["aws.transfer"],
 detail: {
 eventName: events.Match.exactString("SFTPConnectorDirectoryListingCompleted"),
 connectorId: events.Match.exactString(connector.attrConnectorId),
 },
 },
 targets: [new targets.LambdaFunction(startCopiesHandler)],
 });