Not sure about all correspondence but an AI request is treated like a decision. All parties are notified and should receive notification within 3 days. It's a dodgy one coz of the tight timelines involved. If you made a valid objection and weren't notified of the AI request, you've a case for invalidation or an extension of the deadline
Thought as much, but planners dont seem to want to share info here and rock the boat with this big time developer, even though his developments are always left unfinished and never in accordance with planning conditions. A well, the fight for proper planning goes on.