Windows Store app stuck "In certification" - runFullTrust restricted capability review, no response after promised callback

I submitted an app to the Microsoft Store that requires the runFullTrust restricted capability. The submission has been stuck in "In certification" status for an extended manual security review.

I opened a support case (#2609200040000739) through the Engage Center and was told to expect a callback regarding the status of this review. That callback window has now passed with no contact.

Could someone confirm:

1. The current status of the runFullTrust capability review for this submission
2. Typical timeline for this specific type of manual review
3. How to get an update on case #2609200040000739 since the promised callback didn't happen

Thank you.