To receive the recognition result, you need to send the GET request to ABBYY server with the resultUrl which was obtained in the response of the getTaskStatus method:
description="Image.JPG to .pdf" />
However, in some cases, the "&" sequences in the resultUrl might cause the "The specified resource does not exist" error.
To resolve the issue, please try to upload your document one more time, then replace all occurrences of "&" in the result URL with "&" and send the GET request with the modified URL. Please take into account this request should not include any authorization headers in order to avoid errors.
If these recommendations do not help you, kindly send the logs from any HTTP debugger (such as Fiddler or Wireshark) to firstname.lastname@example.org.