Promo Codes not available in Offers?

I've setup an offer GOOG25. I built the price map, source code, inserted a line under TR_WEB_SOURCE_NO, associated the price types with the price maps on every individual performance, added the right to Security.

Despite doing this however, when I go to Ticketing Setup > Production Elements, none of the GOOG25 price types are available for selection under the Mode of Sale tab. Did I miss a step? I've check all my dates & they're all set to expire way far into the future...