If your post to Pinterest are being blocked, and you are receiving the error:

Message from Pinterest: {"message": "Sorry! We blocked this link because it's a redirector and may lead to inappropriate content.", "type": "api"}

Pinterest don't allow most shortened links (because they redirect to another website) for their posts. It would be best to keep links for your Pinterest posts unshortened.

Pinterest blocks links which contain spammy, misleading or inappropriate content.

For more information regarding their policies and community guidelines regarding links attached to a Pin, you can check the page below:

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