I kept running into the error related to DSYNC Id not found for key "[any field here]". Specifically, it was when I was trying to run the job for mapping Products. I must be unclear on setting the shared key, primary keys, etc. Maybe I have an invalid field in my source data?
In some cases this error is being caused by the "batch splitter" and "set as array" options.
For "get products" API endpoint:
As a real-time endpoint (example - Magento 2), it only processes one job at a time.
Because their input is an array already, you will not need to set " set as array option".
All you need to do is enable "batch splitter" in source and not set the "set as array"/"batch splitter" option in the destination (and set the correct share key).