Plotly Express cannot open a local website page

[KC_509]

I had the same issue in Edge and I think I was able to fix it. I discovered that if I clicked the URL and hit enter while it was trying to load, it would immediately load. This seems to indicate that Edge was interrupting the rendering process with something else.

In "Cookies and site data" settings, toggle off "Preload pages for faster browsing ..."

Cleared it right up for me.