Product Registration fails with "Serial number incorrect!"

I'm attempting to register the mesh router that I purchased this week, but after entering the serial number on the first field in the form - which then correctly auto-populates the Product Type with "Wireless" and the Product Name with "ZenWifi_XT8", it reports the failure message in the title upon submission.
It's obviously doing some kind of serial number lookup in order to populate those other fields, so I am at a loss to understand why it then reports the number as incorrect when the form is submitted.
TIA.
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Hello michael,
Please kindly provide the SN in the PM I send you.
I will check it for you.
I have the RT-AX92U two pack and can't register my product either. My S/N is L7IA2D101599
Hello tdeangelis,
May you double check again?
I'm able to do so.
Thank you.