Thread:Noreplyz/@comment-44722369-20200511130052/@comment-5811199-20200513034732

Fandom is updating their software, so new wikis don't have Recent Wiki Activity yet. Unfortunately I can't change it, it's not available because that extension hasn't been updated. Recent Changes is the option that you can use for now.

They know that Wiki Activity is very popular, and they addressed it in the post here: Thread:1828522 - see the "Wiki Activity" part of that first post. So hopefully we'll see it come back.