Four hours ago at approximately 17:30 UTC today on 09 Dec 2020 a bug was introduced into our admin dashboard that blocked the ability for new changes to be pushed out to servers.
This affected all dashboard operations: new apps, new sites, email, domains, etc were held back due to the bug.
It's been corrected and most items should be caught up within the next 30 minutes. Let's Encrypt certificates may take a while longer but will eventually go through.