We have received some inquiries from Mario Kart Tour players in Mexico saying that they are not able to start the app due to the device's time setting not being accurate since the end of daylight savings time.
This might take time for the OS or device manufacturer to adjust.
Until then, please try changing your device's time setting to that of a different country within the same time zone as yours or set the time manually. This may resolve the problem.
The device time settings not only affect the Mario Kart Tour app but all features on your device so please change settings at your own discretion.
We also recommend inquiring to Google or your device provider for advice.