Thank you for the question and using MS Q&A platform.
This is an excepted behaviour when your Azure Data Explorer dataset was created long time before so that it is still using our old dataset model which is not supported by AdditionalColumns.
To resolve this issue, you can just follow the error message to create a new ADX dataset and use this as copy sink.
For more details, refer to Add additional columns during copy.
Hope this will help. Please let us know if any further queries.
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