QOAuth2AuthorizationCodeFlow Now Failing to grant with google's Youtube Insert API

I am not sure if this is related, but recently Google changed its Authorization interface (At least the look of it):

and since then, previously working code snippet:

w->show(); 
//w->page()->profile()->cookieStore()->deleteAllCookies(); 
connect(&oauth, &QOAuth2AuthorizationCodeFlow::authorizeWithBrowser, w, &QWebEngineView::load); 
connect(&oauth, &QOAuth2AuthorizationCodeFlow::granted, w, &QWebEngineView::hide); 
//connect(&oauth, &QOAuth2AuthorizationCodeFlow::authorizeWithBrowser, &QDesktopServices::openUrl);

has stopped sending the "granted" signal, sending the debug message instead:

It was working, its not working anymore, and I can recall the "favicon.ico" popping up previously, although I am not ruling that out as a factor.