These are error codes that are displayed when the Internet connection is unstable.
The following may resolve the issue:
・Play in an area where you can get good connection.
・Try playing at different times.
・Switch between cellular and Wi-Fi connections.
・Restart your router.
・Check the settings of the following apps or software if you are using them:
- Security software
- Content blocker
- VPN
- Go your device settings, tap Network and Internet, and turn off Data Saver.
・Close apps other than Mario Kart Tour.
・Restart your device and Mario Kart Tour.
・In Mario Kart Tour, go to Settings, scroll down to the System section, and turn on Power Saving.