All our Wi-Fi strip lights work with 2.4G internet only. Please set a different SSID for the 2.4G Wi-Fi and 5G Wi-Fi if you have a dual-band router.
The Wi-Fi signal should be strong. Please take the LED light strip closer to the router or reboot your router.
Type in the correct Wi-Fi password. Make sure there is no space in the last character, and no special settings(eg. Mac address filtering) on your router.
Delete the strip from Govee Home App and unplug it for 10 minutes.
Reset the strip light. (Reset: When power on the strip light, press the middle button on the control box four times while holding the power button)
Enable your phone hot spot and test if the strip light will work with it.