Cause
The context publication of the campaign is not published, or stopped being published.
What to do
Publish the context publication or remove the context.
application/problem+json
{
"type": "https://masnet.com/developers/errors/context_unavailable",
"title": "Context unavailable",
"status": 409,
"detail": "...",
"code": "context_unavailable",
"correlation_id": "..."
}