Im curious what way you voted - I didn't vote any of the big 4 because their focus is the 3 year reelection (and act/green is effectively a lab/nat vote). Don't need to answer, just speaking out loud and happy to see others are on the same page.
You don't have to be a citizen to vote in NZ. Permanent resident (or resident visa) is enough. So long as you're entitled to live here indefinetly (and have lived here at least 12 months), you can vote.
Interesting, the "am I eligible to vote" things just say you are if you've been here 12 months and are entitled to stay indefinitely.
I guess one key question is, on a spousal visa, if you split from your spouse are you still entitled to stay here indefinitely? If not that may be why you can't vote. I couldn't find any information specifically on if you can vote on a spouse visa.