Cause
The highlights.activate path requires highlights.content.
What to do
Add highlights.content or remove highlights.activate.
application/problem+json
{
"type": "https://masnet.com/developers/errors/highlights_activate_requires_content",
"title": "Activating highlights without content",
"status": 422,
"detail": "...",
"code": "highlights_activate_requires_content",
"correlation_id": "..."
}