This may because of the problem with your home network or the incompatibility between the machine and the network.
Almost Wi-Fi at home is 5G and 2.4G. Although mobile phones support both networks, most home appliances only support 2.4G.
Turn off the "dual-band in one" function in the background of the router, or change the wifi name to only English and try again. If the device connection is unsuccessful after connecting to Wi-Fi, you can continue to try and restart the Bluetooth switch of the phone or clear the connect App cache.