iPad mini (2021)
It's not possible to send and receive iMessages
Solution 1 of 4: Time zone, date and time aren't correctly set on your tablet
It's important that the date and time are correct as some tablet functions won't work.
Press Settings.
Press General.
Press Date & Time.
Press the indicator next to "Set Automatically" to turn on the function.
Slide your finger upwards starting from the bottom of the screen to return to the home screen.