App stopped being compatible like my tablet

I have a Lenovo M10 HD tablet everything was working fine until today it says the device is not supported.

I urgently need to fix this problem, since the tablet and the app are used for my 7-year-old daughter's school. And today he couldn't go to class because the app doesn't open.

Or is it an error that occurs when the battery has already passed a certain charge limit? Or when it is connected to the charger?

I also tried to open a user for my daughter, but when she asks to confirm the date of birth, it says that the user cannot be created, since she was born in 2015.