What also sucks (such a pedestrian term), is that even if you find an partner award online, especially on Korean Air in a premium cabin, the website will time out and say it is “sold out.”
This happened to me, so I called the Diamond Desk, saw the award space available. Then they put me on hold for 2 hours to reach the partner desk to get the ticket issued, only to be told after the long hold that the inventory wasn’t there.
truly dreadful experience all the way around .