Regarding AP250 serial number registration

[MichioNishimura]

I got an AP250, but the previous owner registered the serial number and I can't register it.
I can't get in touch with the previous owner anymore.
Is there anything I can do?

[RobertZ]

If you have purchased a service contract, GTAC may be able to assist.
 https://www.extremenetworks.com/support/contact