Hi Andy.
Did you buy from a Volvo dealership?
In my experience the stop / start can stop working if the car has been stood for some time. This seems to be quite common during lockdown. It's a very small battery and I wouldn't have thought 71% charge would be enough. However, I had this problem on an XC60 last year and it went away on its own after a couple of long journeys. Failing that, it may need a new auxiliary battery.
Systems that are temporarily unavailable are usually due to blocked sensors (wet leaves etc), but in this case it could be a faulty sensor. You say it's a 20 plate car, so it's still under warranty. If this message continues, your Volvo dealership will sort it.
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XC40 (MY22) Inscription B4P, Denim Blue, Blond Leather, Climate Pack, Versatility Pack, Sunroof, Rear Tints. (previously owned 2017 XC60, 2011 V60, 2004 S60, 1998 S70, 1992 940, 1989 740)
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