Screen Time Exclamation Point with a Red Circle

I had to restore my kid's account on my ipad at one point earlier this year during a replacement. When the new device arrived I re-restored the account on the new one. I then restored my account on the temp ipad.

Screen Time thinks that device is still in use for the kid's account. There is now a message in Screen Time under my kid's name that says:

"Screen Time for ______ ipad has not been available for 7 days. Make sure the device is connected to the internet and is signed into iCloud with _____'s Apple ID."

I would like to deregister this device from the kid's Apple ID to clear this message. How?