Just wondering if ZQN-xSYD-AKL is a valid routing for a domestic award ticket AKL-ZQN-AKL, ie transit through SYD instead of CHC

In my case, I am getting the award ticket through UA MP, but just wondering if an NZ Airpoints member requested the routing ZQN-xSYD-AKL (with same day transit through SYD), would it be allowed ?
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UA 1P
I like NZ,NG,NH,UA,SK,LH & QF
I do not like SQ !