Rotating the pinion and/or the pinion cutout(s) in Right view, by -90 degrees, seems to mesh with the gear.
As drawn it seems slightly smaller than it should be... (It should be re-done using the below pinion crown/heal point.)

In Right view, the left heal corner point of the gear face is located at ( 0, -0.5 * Gear OD, - Pitch Apex to Crown on Gear ).
Get the face by rotating a certain line by (90 degrees - Gear Face Angle).
Add two lines nearly perpendicular to the face line, about 87 degrees and 89 degrees, just so the cutouts extend past the gear blank by a tiny amount.

In Right view, for the rotated pinion, the upper heal corner point of the face is at ( 0, Pitch Apex to Crown on Pinion, 0.5 * Pinion OD ).
Get the face by rotating a certain line by (90 degrees - Pinion Face Angle).

- Brian