CI 4 Session Iframe Protected

Asides from the issues with iframes, I was wondering if this was an urlencode issue?

I don't know much about urlencodes, but taking a look around is essentially passing variables to a certain function.
From what I can see under the iframe, I lose the session and the data, it is as if it no longer communicates with the framework and creates a new instance.
While if I use it from the codeigniter project everything works.
Are you telling me I need to add index.php or change a path?