Webpage Card to display an internal page

Does anyone know if it is possible to use the webpage card to display another HA dashboard page?

I’m trying to create a dashboard where I have multiple additional pages, but I want one main page that has each page embedded so I can add conditions to these to display only relevant rooms based on presence detection.

When I try to use the webpage card it displays the HA loading screen and gets stuck on that.

My setup is HTTPS through Duckdns and Let’s Encrypt so not sure if that is creating the issue?

Thanks all!