If a brand requires you to post a story with an Amazon Associates link, here's how to generate the correct link.
Instructions on how to generate an Amazon Associates Link for an Instagram Story
Log into the Amazon shopping app
Search for the product
Once you’re on the correct product page, click on the square with the arrow pointing up
Click “Copy associates link”
Go to Instagram and click “+your story”
Choose the video or photo to use in your story
Click the box with the smiley face on the top of the screen
Click “link”
Paste the link under URL
Video Tutorial here