Hi there!
Do you have the current version on it? Does it help if you also clear the cache?
Please try it out first, if it doesn't work, then please report again, thanks
Have a nice Weekend
Your game is experiencing this problem because your
game is not connected to the server. There can be various problems.
Therefore, check that your game is connected to the server before
starting the game.
At the moment I ask you to check the following steps.
Check app update> Sign out game> Restart device> Open game and
sign in.
If your game app is damaged, you won't be able to sign in or sign out
of the game. Let me know if you see the image below when you sign in or
sign out.