How to remove index.php from a tag or archive page URL in the root blog?

Question

I'm developing a Multisite where the root site is an agregator (using the mu-sitewide-tags plugin). I created a custom widget to show tags across all sites, but when I click on the tag page on the main blog, it loads like this:

http://example.com/index.php/tag/name_of_the_tag/

I tried to remove it creating a custom permalink, but wordpress doesn't allow to take it off.

Is that possible to do it? Any idea?

Answer 1

try to flush your permalink structure that might be the issue

Answer 2

Make sure you set the permalinks as a Superadmin in the network admin area.