I don’t want to be difficult or too annoying but the Huish/Oceanic app must use this so it is somewhat available even if the process is commercial rather than technical. Before investing a lot of time, effort and money in building an app that relies on this I’d like to have an idea that it will become available to me in a reasonable time frame. Is there a way to open dialogue with a product manager in whichever team is responsible?

I'll save you some messing about... When you wire up your delegate the error handling method will be given an erro no. 110 "Error Domain=CMErrorDomain Code=110" which is CMErrorNotEntitled. See https://developer.apple.com/forums/thread/716919 https://developer.apple.com/forums/thread/716084