[short_url_redirect] doesn't work

So far I love almost everything about your plugin. Thank you very much.

However, [short_url_redirect] doesn’t seem to want to display the URL. A matter of fact, it is like the shortcode doesn’t even exist.

Example…
https://pixl.ink/E0B6e

On a side note, any suggestion or way to make the landing page not visible or accessible if someone navigates to it directly?
https://pixl.ink/url

https://wordpress.org/plugins/shorten-url/