First things first - I’ve removed that screenshot that contains your API key You might want to rotate your keys as well!
It looks like you unfortunately need the Pro version of the plugin so I can’t test this directly - but are you able to make the same call with Postman or Insomnia and have it be successful? Or is it the same error?
On the n8n side of things, it looks like you’re using an older version of the HTTP Request node. You might want to upgrade to the latest version of n8n, and then remove the node and re-add it to the workflow to ensure you’ve got the latest version.
I’d also suggest talking to s2 support here, and seeing if they can give you a cURL request you can then use in the HTTP Request node, as well as maybe ask them which version of their plugin you might need to be using too If the cURL they give you doesn’t work in n8n, you might want to test it out in Postman/Insomnia, and see if you get a different response or error.