What’s the correct schema type for a “Product review”?

I run Meeple Mountain, a board game review website. Many of our articles are “reviews” of board games (a product). After some research I determined that the “Review” schema type was the most appropriate. However, I’m running into some trouble when vetting it against Google’s Rich Results test; getting an “Item does not support reviews” error.

I have the following questions.

1. Is this the correct schema type for a product review?
2. If yes, then am I missing some information which makes this valid?

I’m attaching a screenshot of the edit screen for the link I provided.