Apple watch can't update OS
I just got a new Apple Watch SE. I've connected it to my Apple Account. It's charged at 100% and on the charger, but, when I try to update to the Watch OS to 8.4 from my iPhone it keeps saying that it can't do it because it's not charged to 50% and on the charger. I've tried restarting my iPhone, but it doesn't fix it. Any suggestions?
Apple Watch SE