Remove Quick Access Unpin History For All Users
Some machines exhibit the same error not allowing old pins to be undone.
Copy and Paste:
Remove-Item -Path C:\Users\*\AppData\Roaming\Microsoft\Windows\Recent\AutomaticDestinations\f01b4d95cf55d32a.automaticDestinations-ms -Force
into powershell and hit enter.Close and reopen file explorer. Done. The quick accesss pin customisations and history has deleted on all user profiles on that machine.