If you go to the old Connect site, you'll be redirected to a page that has information for where to submit issues for SQL Server. Here is the text:
Effective January 1, 2018, the community feedback feature of the Microsoft Connect site for SQL Server has been replicated in
UserVoice for the convenience of the community. We have captured all current/active public feedback for SQL Server that was entered into Microsoft Connect and transferred
it into the new forum to help customers find relevant and active matching suggestions.
The shortcut URL you can use is:
http://aka.ms/sqlfeedback
-Jeff Stammler | SQL Server | Microsoft