HTML sitemaps doesnt appear after setting up PS Auto sitemap plugin on my WP

I recently downloaded “PS Auto Sitemap” plugin on my wordpress, to have html sitemap page automatically shown on my website.
However, all my attempts are in vain, to see only “sitemap” title on the html sitemap page and there is no contents, even though I have 7 posts right now.

– Procedures I followed is as below;
1. I created a fixed page “Sitemap” on my wordpress
2. Title: Sitemap, Text: <!– SITEMAP CONTENT REPLACE POINT –>, Permalink: https://MY DOMAIN/site-map
3. Checked ID of created sitemap’s URL
4. Moved on the setting of PS Auto Sitemap and ticked “posting list output”, with inputting the ID I checked above, then updated the setting.

(Questino)
I appreciate if someone tell me why (HTML) sitemap doesnt show up.
*My WP version is 5.4, PS Auto Sitemap: 1.1.9