You have to clear the cookies in Internet Explorer! Spent way too long trying to figure out why this computer was stuck at the redirect page while my other one was working fine. Reboot didn't work, changing local IP and going through a VPN for the public IP didn't work, cleaned the app Bin directory didn't work, clear the app data didn't work, removed the whole APPS directory didn't work, hunt for the URL in the registery didn't work, changed the non hard-coded value in the makeOAuthRequest call didn't work. Tried the cookie in my default Browser (in case it went there) didn't work, clearing the cookies in Edge didn't work, and only once I cleared the cooking in Internet Explorer, did it ask me for my username/password! It's the last place I thought it would be since it's platform specific. Well, live and learn I guess...