Sorry that you cannot import CR2 files in Camera Raw 11 and Lightroom 8.0 version.
Are you getting any error message while importing? Where are you importing the images from(Camera card, primary or external drive) and what is the destination of your import set to in Lightroom?
Is your issue still open? Please try an reset Lightroom preferences back to defaults and check if that helps.
To know more about resetting Lightroom preferences, please refer the following link: https://helpx.adobe.com/lightroom/help/setting-preferences-lightroom.html
Let us know if that helps.