I just tried logging in from the main login screen and was denied access a couple of times. I didn’t want to get locked out, so I put in a search. When I selected the article that I was looking for I clicked to view it and was told I had to login. I entered my credentials at that screen and got in no problem.
Maybe this was a fluke but for those having issues logging in it may be worth a try.

Good luck,
BobE