ADF Pipeline Copy Activity 404

Hi All

I am trying to read a rest API source and copy into Azure SQL in ADF data pipeline.

I have the linked services and datasets set up correctly and tested.

In my data pipeline, i retrieve the api access token from keyvault and call a web activity on the url endpoint with no problems, but when i try to run the same url get call on a copy activity, I get a 404 error with url not found.

Same base and relative url, same headers, same linked service and dataset.

i know the url, linked service, authentication etc are working as my web activity returns the api call correctly, just no idea why the copy activity does not.

Any suggestions?