Update (October 31): The review finally happened today, 9 days after the expedited resubmission. Version 1.1.16 was rejected, but for concrete, fixable reasons. Guidelines 2.3.3 and 2.3.7: our 6.3-inch iPhone screenshots were marketing frames (a lock screen with a notification instead of the app UI), and one of them mentioned "free" replies, which counts as a price reference. We replaced them with plain screenshots of the app in use. Guideline 2.1: App Review asked detailed questions about face data, because our app offers optional identity verification through a third-party provider (selfie + ID document). We answered all of them in App Store Connect and quoted our privacy policy. We replied and resubmitted the same build, and it's back in "Waiting for Review". So if your app is stuck too, it may just be the queue; when it does move, check your screenshots and any third-party SDKs that touch biometrics. A correction to my earlier comment about phone support: the official hours are listed at https://developer.apple.com/support/worldwide-telephone-hours/ (Europe: Mon–Fri, 08:00–17:00 GMT). Outside those hours the Call option shows as unavailable.

Update (October 27): Still "Waiting for Review" for 1.1.16, now 5 days after the new submission with expedite confirmed. Today Developer Support confirmed by phone that everything on our side is in order and that we just need to wait. @pjetski, same answer here. I hope it moves for both of us soon. I'll post again once there is any progress.

Update (October 22): After 12 days in "Waiting for Review" with no movement, we removed version 1.1.14 from review and submitted version 1.1.16 instead, together with the same four in-app purchases, and requested an expedited review again (confirmed). The new build also includes the user-generated content moderation features directly in the binary. I'll post here once there is any progress. Thanks to everyone who looked at this thread.

Update (October 17): On October 15 phone support became available again and I spoke with Apple Developer Support (case 102997214371). They said to expect movement within 48 hours. That time has now passed, and the submission is still in "Waiting for Review". I've added a follow-up to the case. If anyone has gone through something similar and found what helped, I'd really appreciate hearing about it.