the tutorial you used is only for those notifications:
BRANDED_ITEM_CONTENT_CHANGE: Sent whenever there is a change to the title, description, bullet points, or images, for any ASIN that the selling partner has a brand relationship with.
"If you want to receive any other notification type, skip this tutorial and go to Tutorial: Set up notifications (Amazon Simple Queue Service workflow)."
i think you should refer this guide:
https://developer-docs.amazon.com/sp-api/docs/notifications-api-v1-use-case-guide#tutorial-set-up-notifications-amazon-simple-queue-service-workflow
its a bit confusing :
the tutorial you used is only for those notifications:
BRANDED_ITEM_CONTENT_CHANGE: Sent whenever there is a change to the title, description, bullet points, or images, for any ASIN that the selling partner has a brand relationship with.
ITEM_PRODUCT_TYPE_CHANGE: LISTINGS_ITEM_STATUS_CHANGE: LISTINGS_ITEM_ISSUES_CHANGE: PRODUCT_TYPE_DEFINITIONS_CHANGE: ...
"If you want to receive any other notification type, skip this tutorial and go to Tutorial: Set up notifications (Amazon Simple Queue Service workflow)."
@ao-2040 Thank you for your answer. We already using the Tutorial: Set up notifications guide but the queue is still not working