Why can't the robot APP enter the remote control mode?

When the robot and the mobile APP are not connected to the same WiFi , click to enter the remote control APP and prompt "Before entering the remote control, please keep the mobile phone and the device under the same WiFi "; for safety reasons, the robot and the mobile APP need to be connected to the same WiFi Only then can you enter the remote control mode (Note: The current WiFi connection of the robot is the same as the WiFi connected to the network configuration ).