Missing In-App-Purchase section in iTunes Connect

In-app purchases section in "App Store" tab visible only if you have atleast one in-app purchase with status "Ready to submit".

You will NOT see In-app purchases section in "App Store" tab while single/all purchase item/s in "Waiting for Review" status. They should be "Ready to Submit".

Simply do NOT press "Submit for Review" button from "Features" tab.

Just attach your purchase item/s from "App Store" tab and submit binary.

I had the same issue. This is on the form where you enter the details for a specific version. The first time you submit a new version there's an "In-App Purchases" section which lets you link specific IAPs to that version. Then, if it's rejected, this section of the form disappears. So what's missing is the ability to link specific products to specific versions.

For clarity, the top tab selected is "App Store" and then in the left-hand menu under the IOS App section you select the version of the app you are working on.