New Posts Exist But Page Doesn’t

Hi WordPress Forum Folks, I’m having (for me at least) an odd situation. I’m a bit removed from my prime days where I was actively using WordPress, by about 4 years, and just kinda lost on this.

So I’m trying to get my site up, and generally happy with where its at looks wise, so I made my first post. Post shows up on the front page, and Recent Posts. But when you follow that link it comes up with “Oops! That page can’t be found.”

I’ve tried multiple different posts to be sure. Tried with different themes. Tried with the Classic Editor plugin both on and off. And yet, nothing. I can’t seem to figure out why I can’t get the pages for any post to work.

Anyone got any ideas on this?

The page I need help with: [log in to see the link]