Convert WebPage to PDF for our Office365 sites

We are trying to do a Create from Webpage for some pages on our M365 Sharepoint site with multiple sublevels..

But because it requires a login, it only captures a page saying "Sign in to your account". 

I logged into the site on all of my browsers, and it still doesn't work.   How do I pre-authenticate in a way that will allow me to capture the website.   The Browser plug-in doesn't seem to allow capturing sublevels, otherwise I would use that. 

Thanks!