I'm sending the trackEvent call and getting a 200 response from the omtrdc endpoint. However when I check in the Reports dashboard of my experience, the conversion metric doesn't increment.
I double checked that my conversion mbox is spelled correctly in the trackEvent call, and I tried with both the "Viewed an mbox" and "Clicked on an mbox" conversion metrics.
If firing a custom mbox via a trackEvent "viewed an mbox" is the correct conversion metric setting. Some follow up questions I have to help you get this sorted: