Hello,
Please check your HikaMarket ACL to be sure that the ACL "order/notify" is right available.
And please add the "administrator" as a "User" under the vendor configuration so, the vendor will have an entry for that user to tell him to send the notification to that user (and email address).
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.