Trouble with Eagle's BGA autorouter
You cannot have 2mm minimum via diameter, if the datasheet recommends 0.2mm via diameter. Observe the recommendations in section 8.5.1 BGA 216 0.8mm Pitch Design Example below.

The autorouter will be failing because the rules are too strict to place tracks and vias. Routing is impossible without reducing the minimum via size, track width and reducing the clearances. Check with your PCB fab house on their capabilities.