40001: Invalid request body

The body of the request could not be processed because it was invalid, missing required fields, or not in the expected format.

What you should do

Correct the request body so it matches what the endpoint expects, then resend. Start from the accompanying error message: it names the specific problem, such as a field of the wrong type or a missing required field.

Why it happens

The body of the request could not be parsed or failed validation. Common cases are a malformed or non-JSON body, a missing required field, or a value of the wrong type. It most often appears on token requests, where a field is absent or not in the expected form.

What you'll see

The error is reported with code 40001 and HTTP status 400. The message varies with the cause and usually names the offending part, for example invalid request body: ....