We got the licence for The Last Player just over a week ago, didn't understand why it wasn't working when we tried to test. If I hadn't seen a post from Nick Wallace on the Springboard Facebook group saying what the issue was I would've never have known.
Wouldn't it have been a good idea to email all those with licences or even put a post on here explaining the issue and fix without us having to search for the problem or each raise a ticket?
Having deleted the content, I enabled the content on the marketplace again and there are no steam keys to issue. Are you getting more keys?