CefRequestHandler::GetAuthCredentials may not be called.
https://allabout.co.jp/gm/gc/23780/
The above page is an article that explains Basic authentication.
GetAuthCredentials is not called when I open the link to the sample page in the middle of the page.
It is not called in CEF 90.6.5, but it is called successfully in CEF 89.0.17.
I can reproduce this issue too with cefclient.
The above link seems to be redirecting to the sample page.
It was fine if I opened the sample page directly.
Windows 10 Pro 64bit 20H2 (Japanese)
Visual Studio 2017 Version 15.9.35