I see that your post is from a couple of years back, but I'll do my best to help you out with the ""API Permission Denied"" error you encountered on Instagram. It can be frustrating when your post doesn't get posted due to such issues. To resolve the error, it's crucial to review your API permissions. Make sure you have granted the necessary access rights for your Instagram API. If you're unsure how to do that, it's worth seeking detailed guidelines or reaching out to Instagram support for assistance. By the way, if you're interested in testing your API integrations and ensuring smooth functionality, ZAPTEST can be a useful tool. It provides insights on various testing approaches, including sanity testing and more.