Studio Snippet GetRESTProxy 401 Unauthorized

Trying to hit our internal API from a CXone Studio snippet. The GetRESTProxy action keeps failing with a 401 error even though the URL works in Postman.

<GetRESTProxy name="CallAPI">
 <SetProperties name="url" value="https://api.example.com/data" />
 <SetProperties name="method" value="GET" />
</GetRESTProxy>
  • CXone Studio v4.2
  • Internal API uses Basic Auth
  • No custom headers set in snippet

What am I missing?