Help Needed with Netlify Redirects Not Working

Since the status is 200 that is considered a rewrite not a redirect.
If working correctly the URL would remain as / but show the /verification-page.html page

How did you confirm this?
Using the Deploy File Browser?
Navigating directly to /verification-page.html?

Do you mean the root level of the repository, or the root level of the Publish directory?
It should be in the Publish directory.

I may be wrong, but I believe this usually mentions how many rules were processed.
You should check the location, name, contents of the _redirects file again.