License error: missing serial number

[simoncn]

On QNAP, MinimServer obtains the device serial number from QNAP QTS to store as part of the license details. On a very small number of machines, QNAP QTS doesn't return the serial number correctly. This is caused by a QNAP hardware or firmware issue and can usually be fixed by QNAP technical suport.

If you login to QNAP QTS and select Control Panel > System > System Status, what do you see for the serial number?