We know you’re an experienced bird owner, but we don’t know your past feeding practices and can’t really explain how a particular Amazon’s feeding preferences will vary from other species. I’ll just say this:
You can never say that your Amazon doesn’t like Vegetable A or Vegetable B after just offering it once or twice, and removing that vegetable totally from his future diet because you don’t think he likes it.
Yes, after months of trying and he still won’t touch it, okay...you know.
But more likely, if you keep introducing that same veg to him on and off, cut into different shapes and sizes, he’ll start eating it.
Archie loves beets, but they’re too high in sugar, so he only gets it every week or two. Doesn’t love carrots, but he gets them every week ANYWAY.
Sometimes, he doesn’t run to eat his beet, and sometimes, he runs to eat the carrot. (I use small baby carrots.)
There is no rhyme or reason as to why many birds like mine prefer one thing on one day and another on a different day. But it’s important to never get lazy and put him into a food rut with the same thing day after day. You have to switch it up EVERY day, or as much as possible. (I don’t believe in chops, unless you make several different ones, but that’s just me.)
I’m constantly buying different vegetables for Archie, and he eats 75% of them. If 25% goes in the garbage, so be it. But personally...
I find shopping for and feeding him the most enjoyable part of having him.