Cause
The destination does not use OAuth with private_key_jwt.
What to do
Only the key of a destination with that authentication is rotated.
application/problem+json
{
"type": "https://masnet.com/developers/errors/auth_not_rotatable",
"title": "Authentication not rotatable",
"status": 409,
"detail": "...",
"code": "auth_not_rotatable",
"correlation_id": "..."
}