Yum Repo not working?

I have a Spacewalk running on CentOS which I have to replace with Katello.
I've added https://artifacts.elastic.co/packages/7.x/yum as a repo to Katello (exactly as on Spacewalk), but when I try to sync with that repository, Katello fails.
And if I try to open that URL on the browser I get a 404 error.

I'm pretty sure that the error is on my side, but I don't know what's wrong.

EDIT: On Spacewalk last successful sync was back in march of this year.