Failing to connect to Wi-Fi despite entering the correct wireless password is typically caused by router frequency band incompatibilities, MAC address filtering, or IP address allocation conflicts. Many smart home devices and thermostats require a 2.4 GHz network frequency and cannot process a 5 GHz signal; if your router combines both bands under one SSID, the device may fail authentication. Additionally, if your router has security settings like MAC address filtering enabled, it will block unknown devices from joining the network even with the right password. You can troubleshoot by logging into your router admin panel to enable a dedicated 2.4 GHz guest network and temporarily disabling advanced security filters. You can verify success when the device successfully authenticates and establishes a stable connection.
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