Cloudflare Image API Make Image Private Doesn't Work

I tried to follow the document to make the upload image url private via the link: https://developers.cloudflare.com/images/cloudflare-images/upload-images/make-an-image-private
I passed all arguments as the doc required but it doesn’t work, I still can view my public image.
I need to hide the public image for security so hope this API works otherwise I have to find the other way to make it private.
Thank you, btw Cloudflare image is really helpful for resizing.

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