It is still possible to use Internet Explorer. You just need to remove the BHO that's responsible for auto-closing the program and redirecting you to Edge.
Do you get the real MSIE, or some weird embedded MSIE?
I remember when I was trying to log into GitHub to activate Visual Studio 2019, the embedded browser looked like a historical version of Internet Explorer, and it kept generating endless dialog boxes complaining about script errors on the page.