So I just finished asking support about it as I had the same issue, according to them the feature was removed for some or other reason, I did ask them couldn't they place a post or a notification and they also did not have answers about it, seems to me it might have caused to many bugs as I believe it could make the game super unbalanced.
but maybe they are working on either reintroducing it or to patch it out so that it doesn't mention the ACP at all