I was using the "Google Family Link" parental-control software to supervise a device. I wanted to stop supervising the device. So, in the Family Link parent app, I tapped "stop supervision".
Google sent an email saying that I'd stopped supervision. But Family Link continued to show a notification on the device saying that it was under supervision, and it still continued to forbid certain actions on the device.
Even rebooting the device didn't help.
What's the solution?