Mine, a MY17 purchased July 2016, did a similar thing whilst on holiday last September.
We had driven about 15 miles to the beach, had a walk lasting 45 minutes or so. On returning to the car the dash lit up as normal but there was no reaction from the car when I turned the control to start the car.
Very long story short, my car was recovered to my dealer. Initially they though it was the battery, they replaced it but the following morning the battery was completely discharged, after much investigation, including replacing the main battery again, they found the electronic steering lock had failed. That was replaced and I have not had a problem since.
Good luck with getting your sorted, let us know what happens.
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MY17 XC90 D5 Power-pulse Inscription, 5 Double Spoke alloys, Luminous Sand, Amber Leather, Linear Walnut Inlays, Winter Pack, Xenium Pack, BLIS, Dark Tinted Windows, Towbar, Mud flaps, PoleStar
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