YouTube Shorts might not be working due to several common reasons: weak or unstable internet connection, an outdated YouTube app, corrupted cache or app data, device compatibility issues, or even temporary YouTube server outages. Other factors include browser incompatibility and problems with the video format optimized for mobile viewing. Troubleshooting steps to fix this include updating the app, clearing cache and data, checking internet connectivity, restarting the device, and ensuring the device's operating system is up to date. Also, checking YouTube's server status or trying another device or browser may help resolve the issue. If the problem persists, it could be related to YouTube's internal issues or restrictions in the user's region.