Cause
The target publication does not exist as an active object of the same integration and environment, or its channel is not granted. When activating the highlight, a target that is no longer published responds 409.
What to do
Create and publish the target publication first with this integration.
application/problem+json
{
"type": "https://masnet.com/developers/errors/target_unavailable",
"title": "Target unavailable",
"status": 422,
"detail": "...",
"code": "target_unavailable",
"correlation_id": "..."
}