- https://aa.wikipedia.org/w/index.php?title=Main_Page&action=info: Wiki and page exist, page views listed on action=info, interactive graph works (PageViewInfo extension).
- https://wikimedia.org/api/rest_v1/metrics/pageviews/top-by-country/aa.wikipedia.org/all-access/2018/01: Backend has the data available
- https://tools.wmflabs.org/pageviews/?project=aa.wikipedia.org&pages=Main_Page: Works
But it seems that on https://stats.wikimedia.org/v2/ one cannot look for aa.wikipedia.org through the UI. Typing it regardless seems to force use of the first suggestion, viewing data from the unrelated kaa.wikipedia.org domain.
I tried working around it by manually changing the url and reloading does work at https://stats.wikimedia.org/v2/#/aa.wikipedia.org and produces the correct data from the backends, but the interface marks the input field with "INVALID".
There are a few other (closed) wikis that exist, have page view data available, but are not suggested in the interface, including https://za.wiktionary.org (zawiktionary).
On the other hand, there some closed projects that are listed in Wikistats 2.0, but actually do not have pageview data at the moment. Such as https://stats.wikimedia.org/v2/#/usability.wikimedia.org which is suggested as valid target, but results in "Something went wrong" displayed instead of graphs. (For this wiki, it seems RESTBase/metrics has no data, not sure why.)