If your Linksys Router Guest Access Not Working Issue the persists, performing a factory reset on your Linksys router might be necessary. Locate the small reset button on the back or bottom of the router, usually labeled "Reset" or "Restore Factory Settings." Using a paperclip or a similar tool, press and hold the reset button for approximately 10 seconds. Keep in mind that a factory reset will erase all your personalized settings, so you'll need to reconfigure your router from scratch. After the reset, set up the guest access feature again and check if it now functions correctly.