404 issue

Hello I have a URL using permalink manager but for some reason it keeps going to a 404 despite the page existing.

Here is the debug from the URL:


Array

(

    [uri_parts] => Array

        (

            [lang] => 

            [uri] => resources/training-courses/5g-foundations-training-course-2

            [endpoint] => 

            [endpoint_value] => 

        )

    [old_query_vars] => Array

        (

            [page] => 

            [pagename] => resources/training-courses

        )

    [new_query_vars] => Array

        (

            [pagename] => resources/training-courses/5g-foundations-training-course-2

            [do_not_redirect] => 1

        )

    [pm_query] => 20358

    [content_type] => Post type: page

    [version] => 2.4.4.2

)