I am getting an error message "loading failed,Please try again later (99999)" when trying to enter a device, what should I do?

I am getting an error message "loading failed,Please try again later (99999)" when trying to enter a device, what should I do?

1.Clear the App cache. (Usually it fixes the problem)
How to clear the App cache: Tap "Me" in the bottom right corner>Tap the "Hexagon icon">Tap “Clear Cache”>Cache cleared successfully.
2. Please restart your phone;