If your Hulu activation code isn't working, there could be several reasons. First, ensure you're entering the code correctly at hulu.com/activate. Double-check for any typos or mistakes. Sometimes, codes can expire, so make sure it's still valid. Another common issue is account-related problems, such as an inactive subscription or payment issues. Additionally, browser problems like outdated software or cookies/cache issues can interfere. Try clearing your browser’s cache or using a different browser. If problems persist, contact Hulu support for further assistance to resolve the activation issue efficiently.