I'm not sure if this is a bug or if it wasn't fully implemented. If anyone knows more it would be great if you shared with everyone on the forums.

All i can see when i click on CO-OP vs Ai is the computer difficulty selection buttons, and the back button. The main buttons at the top left still function but there is no way to try to start a CO-OP vs Ai match search, as the button is grayed out waiting for more information from the above missing buttons.

This is purposely disabled for the time being.