Instagram earlier allowed only users with more than 10,000 followers to post links in Stories. However, it recently removed that condition and now any user can add links to their Instagram Stories. The steps to add links to Instagram Stories are really simple.

source https://gadgets.ndtv.com/how-to/features/how-to-add-links-to-instagram-stories-steps-guide-2592593#rss-gadgets-all