Adding an update here after calling Apple Support. I contacted Apple by phone today, hoping to get some clarity on why the app and IAP review appear to be stuck. The support representative told me that the IAP review is handled by a different team, that they do not have visibility into it, and that they are unable to take any action. This is extremely frustrating. If phone support cannot see the case, cannot contact the relevant review team, and cannot provide a concrete next step, then what is the correct support channel for developers in this situation? At this point, we have: an app submission sitting with no movement, IAP review apparently handled by a separate team, email support requests with no response, a previous forum escalation that said the case would be investigated, but no follow-up, and phone support saying they cannot help. We are not asking for special treatment. We are asking for a real status update and a working escalation path. Our app has been unable to ship updates to users since May 11, and this is now causing real operational impact. Could someone from App Review or the IAP review team please check the actual state of this submission and contact us in App Store Connect with a concrete update or next step?

@App Review I want to emphasize that this appears to be the same escalation path we were given previously: App Review said the case would be investigated, but after that there was no follow-up in App Store Connect, no email response, and no movement on the submission. Could you please make sure this investigation is actually opened and followed through this time? If possible, please provide an update through App Store Connect with a concrete status or next step, so we know the case is being actively handled rather than simply waiting in the queue indefinitely. Thank you.

I've also sent multiple support requests by email about this, and so far not a single one has gotten a response either.

still no response...