APIではカスタムユーザーフィールドが利用できません

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public user custom fields のサイト設定にユーザーフィールドを追加しましたか？

Adding non-visible user custom fields to the API

This guide explains how to expose user custom field data through the API without displaying it on a user card. Required user level: Administrator This guide will walk you through the process of making User Custom Field data accessible via the API without displaying it on a user card. This can be useful when you need to programmatically access custom user data while keeping it hidden from general view. Creating a User Custom Field First, create your User Cu…