How To Reference Custom Taxonomy Terms

Problem: I’m getting a 404 Not Found message when trying to open a page containing all the entries for a particular term.

Scenario:
A custom content type called “video”
Attached is a custom taxonomy also called video with terms “cash” and “cash flow”

What I want to do is to produce the following
My top level page is called Library and contains a link to a page that displays custom content type ‘named video’. The content of the page is a list of terms from the taxonomy attached to the custom content type viz:
– Cash
– Cash Flow

This result is produced using this template code:

<h2>Video Subjects</h2>
<p>Click to see the list of videos under a particular subject</p>
			<?php $args_list = array(
'taxonomy' => 'video', // Registered tax name
			'orderby'            => 'name',
			'style'              => '',
 			'title_li'           => __(none )
);
echo wp_list_categories($args_list);

?>

When you look at the list of terms on the page each one is a link to titles attached to that particular term, so the links are:

• https://www.example.com/library/video/cash
• https://www.example.com/library/video/cash-flow

Simply clicking on this link produces a page not found.
Note that I have a template titled “taxonomy-video-cash” but clicking on the link for ‘cash’ still produces a page not found.

As a result I created a page with a permalink of

https://www.example.com/library/video

And attached the template ‘taxonomy-video-cash.php

<?php				$videoquery = new WP_Query( array( 'post_type' => 'video',  'terms' =>'cash',  'posts_per_page' => 10 ));

// The Loop
if ($videoquery->have_posts()) {

 while ( $videoquery->have_posts() ): $videoquery->the_post();
	echo '<li>';
	the_title();
	echo '</li>';
endwhile;
};
// Reset Post Data
wp_reset_postdata();

?>

This also causes a Page Not Found result.

Note: I’m using the plugin ‘Custom Post Type UI’, with a rewrite on the Custom Post Type set to library/video

Any suggestions on how to produce the display of titles for a particular term.

I’ve done a lot of searching on this subject and the totality of advice and tutorials just seems unusually confusing since I’m very much a neophyte in using WordPress.

Thanks