Architect Data Action: JSON parsing error on Cognigy profile token response

Data action fails with “Unexpected token < in JSON at position 0” when hitting our Cognigy endpoint. The response is definitely JSON but the Architect step bombs. Here’s the config:

{
 "method": "POST",
 "url": "https://api.cognigy.com/v1/profiles",
 "headers": {
 "Authorization": "Bearer ${token}"
 }
}

What’s wrong with the mapping?