Vivoactive 4S dead after getting wet

My Vivoactive 4S is dead after a workout at the beach and a very quick (less than 10 second) submerge in the water. I have tried charging- it briefly shows the blue triangle and the battery icon with the lightening bolt and then switches off. I’ve held down the A button for 60 seconds and I’ve put it in rice for the night and all day. It is less than 1 year old (purchased April 2024). I was on hold with Garmin support for over 40 minutes this afternoon.