My app was initially rejected and is now in "Prepare for Submission" status after fixing all issues. The IAPs were subsequently rejected and are now in "Developer Action Needed" status.
All IAP issues have been resolved and "Submit for Review" is enabled for both the app and IAPs, however:
1- IAP status remains "Developer Action Needed" despite being ready.
2- The "In-App Purchases and Subscriptions" section is missing from the main binary screen.
3- Cannot link IAPs to the current build since this is the first IAP submission for the app.