Troubleshooting 401 Unauthorized Error in Close CRM API with Clay

Hi, I'm trying to use the HTTP API to pull a smart views from Close CRM. I've tested the API in postman and it's working with a Basic Auth. However, when I run the HTTP API in Clay it doesn't work. Clay received a 401 error from the API with Content: {"error": "Unauthorized"} I've tried adding the API key as the header account, and in the headers (seperate and combined) and it's not working. Could someone help please?