@rodcom,
I have the same challenge, but no answers yet. Mine go a bit further too: while the app properly reflects the car’s charging status, like yours mine also won’t properly operate climate control (important as it gets colder here), nor the door locking functions. Importantly, my vehicle location (on the app only) is also seriously hit or miss - and most frequently miss. All of this worked perfectly until a few weeks ago.
Looking for ideas here too.
All functions that were available from my phone and all the Macan's internet communications were locked up and not cured until the dealer conversed with Porsche and had the car's software all reset.
Don’t know about in the US but the App in the UK ‘store‘ was updated today. Perhaps downloading the update may solve it without losing the existing data.