Wordpress Clean URLs show "Page Not Found"
Please check that you the base page here: https://example.org/wp-admin/admin.php?page=CiviCRM&amp;q=civicrm/admin/setting/uf&amp;reset=1

The value here 



Should be an existing published WP Page.

I would then revisit the permalinks page.  

That should 'fix' it.