Troubleshooting activation issues on yt.be/activate involves several steps. First, ensure you have a stable internet connection. Next, verify that you're entering the correct activation code displayed on your device. Clear your browser cache and cookies, then try again. If the problem persists, use a different browser or device to complete the activation process. Ensure your YouTube app and device software are up-to-date. If none of these steps work, check the YouTube Help Center for specific troubleshooting guides or contact YouTube support for further assistance.