Board Thread:Support Requests - Getting Technical/@comment-27749819-20161123004541/@comment-25024589-20161123010006

The current, classic forums are gradually being phased out in favor of Discussions; as of now, newly-created wikis automatically have Discussions enabled in place of forums. If you still wish to have any sort of forum on your wiki, consider adding "wiki-style" forums.

You can refer to this blog for more information on Discussions.