Cypress.io cannot find any element, body or class

Question

I've started testing a .jsp page which includes iframes.

After visiting the page it cannot find a single element, img, class etc etc. Even using the playground selector it doesn't seem to recognize any link or elements. I'm unsure if I need to target the iframe first or not.

Below is a recording of the playground selector not finding anything. https://recordit.co/aQC6Awpxwy

I've added a screenshot of some source code below to help if anyone has any suggestions I can try. Looks to be #Documents embedded inside of iframes, I have no idea where to start.