Thank you for reaching us out. I am Sherwin from Google Ads API support team. I hope that you are doing well today.
With regard to your concern. We totally agree that
customer.conversion_tracking_setting.conversion_tracking_id should be allowed in Order by clause because it is sortable. For us to further investigate your concern, could you please provide us the complete
request and
response logs with
request ID and
request header generated on your end? You can provide it by sending it to our email address
googleadsa...@google.com. If you haven't enabled the logging yet, logging can be enabled by navigating to the Client libraries > Your client library (ex. Java) > Logging documentation, which you can access from this
link. Let us help you find out what is the main cause of that error and provide a proper solution to solve it.