Parameter passing differences between Web activity and Copy activity with REST dataset. Web activity success but Copy Activity error 401

Question

I have a project that requires data to be imported into Azure SQL DB using Azure Data Factory from Sage 300 REST API. The REST API requires a Cookie as part of the Header of the POST method.

Data is successfully returned from SAGE using the Web activity. Below is the example of the code.

Below is an example of the Copy activity used

and below is the example of the ERROR received back:

Can you please help identify how to send the Header information through so that I do not get Authorisation issues?

Kind Regards

Gauchet