Hi @Kyle Bender ,
Welcome to Microsoft Q&A platform and thanks for posting your question here.
I understand you are facing issue while performing Upsert using Azure data factory, I do not have a laboratory for Azure PostGreSQL to reproduce your issue, could you please help me with more details :
- Complete error message, the above provided error is too vague to reach to any conclusion.
- Screenshot of the copy activity configuration, what are the keycolumns you are using for upsert.
Looking forward towards your response. Thanks