I’ve been trying to unlink my kid’s old tablet from my Family Link account but can’t find the option anywhere in the settings. I already tried removing it from the device list in the app, but it just stays there. Is there a specific step I’m missing to fully delete it?
Great question — what worked for us was going into the Family Link app, tapping on the child’s profile, then selecting “Manage settings” > “Account info” > and scrolling down to find the option to delete the supervised account entirely from that device. If the device is offline or factory reset already, sometimes you have to remove it through your Google account settings at myaccount.google.com instead. Hope that helps get it sorted! 
Yeah, Family Link can be annoyingly stubborn with that. You might need to stop supervision first through the app before it’ll let you fully remove the device—I had to dig around in the settings myself recently for something similar.