This same topic was also posted on AWS re:Post. I’ll repost my reply below…
The error code OtaJobParseErrNonConformingJobDoc and the message:
OTA: Failed to extract document parameter: error=4, paramter key=sig-sha256-ecdsa I (514404) OTA: Failed to parse JSON document as AFR_OTA job
make me thing your job document is somehow formatted incorrectly. How did you create the job? Is there any obvious difference in the job document between your failing job and your successful job (AFR_OTA-esp32c305)?