wp_nonce_field() is intended to echo out the nonce as a hidden field in your form, but above you seem to have it somewhere else. If you want to create a nonce outside of the form HTML you need to be using wp_create_nonce(). By default the API is expecting a nonce key of wp_rest. No idea what yours is, because you haven’t included the constructor where you’re setting $this->nonce_key.
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