wixStores_onFulfillmentUpdated is not triggered

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I’m trying to follow the example in this link https://www.wix.com/velo/reference/wix-stores-backend/updatefulfillment and trying to test in the Site Monitoring but I don’t see any event triggerd I have tried other events and it’s working like on create cart. I don’t know what is wrong with this one.
I go to the store order select the order => More Actions => mark as fulfilled or unfulfilled.
this is my code

 export function wixStores_onFulfillmentCreated(event) {
 const orderId = event.orderId;
 const fulfillmentId = event.fulfillmentId;
 const trackingNumber = event.trackingInfo.trackingNumber;
  console.log(orderId); 
}