Cause
archive requires a closed campaign.
What to do
Close the campaign with close and then archive it.
application/problem+json
{
"type": "https://masnet.com/developers/errors/campaign_not_closed",
"title": "Campaign is not closed",
"status": 409,
"detail": "...",
"code": "campaign_not_closed",
"correlation_id": "..."
}