Can't get any requests to work on the built in tool at https://wikimedia.org/api/rest_v1/#/

Steps to produce:

1. go to https://wikimedia.org/api/rest_v1/#/
2. expand pageviews data
3. click Try it out
4. use the following parameters: en.wikipedia.org all-access all-agents dubstep daily 20200101 20200901
5. click execute

Expected Result:
A report of all views on the Dubstep page from January to September

Actual Result:
When clicking Execute, the feedback from the server says

TypeError: Failed to fetch

If I instead use the URL provided (below) I only get two entries with erroneous views in February and March

https://wikimedia.org/api/rest_v1/metrics/pageviews/per-article/en.wikipedia.org/all-access/all-agents/dubstep/daily/20200101/20200901