Hi Mike,
Thank you for reaching out. Did you make sure that the order of your calls is correct (you're not referencing a negative ID that doesn't exist yet)? If so, please share your complete detailed request and response logs
via Reply privately to author so that I can further investigate the issue. I know that the logs may be very long for a batch operation so if you could try and truncate it down to just the relevant calls that are causing the error that would be really helpful. You can find information on enabling logging in the dropdown of your client library on the left-hand side of the screen
here.
Regards,
Mitchell
Google Ads API Team

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