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Generally, this error means that the request cannot be fulfilled due to bad syntax. In some cases, this response code is returned for a request with bad authorization data. Let me share with you a few details about this so you can fix this error.
We have a specialized team that is more knowledgeable with this kind of error code. Let me direct you to our Intuit Developers so you can ask questions from there and help you fix this.
For more information, you can also refer to these help articles if you have any other concerns about QuickBooks Online.
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