Solutions：
1. Confirm whether the WiFi password entered is correct.
2. Confirm that the robot is in the good signal coverage range of the router.
3. Confirm that Mi Home App has been upgraded to the latest version.
4. Make sure the router accesses the Internet correctly.
5. Make sure that the router does not enable whitelist filtering.
6. Confirm whether the DHCP function of the router is enabled correctly.
7. Verify that the router has enough IP to allocate.
8. Some models may turn off the location service permission of Mi Home APP, resulting in connection problems.
9. The default uppercase function of iOS mobile phone will lead to the wrong password input and the WiFi cannot be connected.
10. Confirm whether the SSID of WiFi has special characters, and suggest using English + number.
11. Try to replace other operating systems. Different operating systems have different ways of maintenance.
12. Try to create a hotspot on the phone and check the router Settings.
