Discussions is getting positive feedback from our community so far.
You mentioned that it would be available on our app but it's not showing up (I uninstalled and reinstalled just to make sure) like it does on the Marvel and the other apps of the other early adopters. Is there something I need to do to make that happen?
We've seen that with a couple other apps where it was supposed to become active yesterday/today, and are looking into it. It should be soon, and I'll follow up here when we can confirm something more. Sorry for the delay!
Using a message wall is not recommended, the best way to contact staff to move a page into the namespace is to use Special:Contact/general with a link to your wiki, the page you want moved and why you want it in the MediaWiki namespace.