How can I remove an old device from a child's MS family account?

[Windows Server]

My son got a new computer and we added it to his MS account. Then I removed the old device from his account - but my MS Family account still shows the old device. I'm sure this problem has come up before but wondering if anyone has finally found a solution. I've tried removing him from the Family account, confirming the one device on this MS account and then re-adding him but it still shows the old device. Any help is much appreciated.

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