Only way i've managed to force these to remove reservations is to set a static reservation against the mac address of the switch within my dhcp server, manually deleting all of the other reservations the switch has, configuring the static to be correct within the dashboard then hitting the manual reset button and forcing the switch to factory reset & pull its dashboard config again. Seems to clear the reservations & fix the leasing issue, but you will ofcourse suffer downtime!
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