queue is not working

Hello, I’m writing to you to ask for your help. We were using this guide for creating notifications - https://developer-docs.amazon.com/sp-api/docs/notifications-api-v1-use-case-guide Unfortunately, the queue is not working

Here is the link on the event we should get - https://developer-docs.amazon.com/sp-api/docs/notifications-api-v1-use-case-guide#order_status_change This event type says that we should receive information about the order, but the queue is empty and we do not see new notifications (See attached screenshots).