Data Action JSON parse error on Cognigy profile token lookup

Trying to map a Cognigy profile token to a Genesys Cloud variable in a Data Action. The endpoint returns valid JSON, but the Data Action keeps failing with a parse error. The response looks fine in Postman.

{"result": "success", "token": "abc123"}

Is the schema validation too strict for nested objects? The docs say it handles standard JSON. Maybe the charset encoding is off.