WiFi network not showing up is a common issue it occurs due to several reasons, including router issues like being powered off, out of range, or having outdated firmware. Device-related problems like WiFi being disabled, airplane mode, or outdated network adapters can also be the cause. Network settings such as hidden SSID, frequency mismatches, or incorrect configurations may interfere. Additionally, interference from physical barriers or other devices, ISP outages, incorrect passwords, or faulty hardware can contribute to the issue, making the network undetectable.