I have seen this problem arise from multiple sources. I am trying to submit my app but a new app version must be bundled with the subscription. The guide consistently says (copy pasted from the "Submit an In-App Purchase" guide)
_"On the right, scroll down to the In-App Purchases and Subscriptions section.
Click Select In-App Purchases or Subscriptions, or if you’ve already started selecting In-App Purchases or subscriptions, click Edit."_
The problem is there IS NO In-App Purchases or subscription section in the the app section.
I have submitted again but at this point I'm loosing hope. I am hoping that adding a StoreKit config file this time on the Xcode side will help however again reading "submission (1)" does not give much hope.
Please help as this has delayed launch by quite a lot.