Sometimes, it might be because your account doesn't have the necessary permissions. Check your account settings or contact the platform's support team for assistance.
There could be a problem with the content of your story. Some platforms don't allow links in certain types of content or if it violates their terms of service. Review your story and the platform's guidelines to figure it out.
It could be that you haven't followed the correct procedure for adding links. Make sure you're doing it exactly as the instructions say. Sometimes, there might be specific formatting or permission requirements that you haven't met.