Please do the following:
- Ensure that you have downloaded the game from the official game's page.
- Ensure that you don't use adblockers, VPN apps, anti-viruses, or other apps that may block data sharing.
- Use a different Internet connection, as your internet provider may block connection with the game server.
- Clear the game cache in your device settings.
- Restart your device (turn it off, then turn it on again).