For over a year I have been experiencing the symptoms described here.
I enter credentials
credential box disappears
the next step in authentication is the multifactor system, but the client only shows please enter username and password and th MFA prompt never comes. (Until about an hour after the machine has started it may begin working properly again, and only select users are affected. )
The issue may happen on one or more VPNs in the organization and typically happens after a restart of the client computer
The issue spans from version 4.3 all the way to the version I am on now version 4.9
There is very limited information on it, I was only able to find two relevant dead end threads, one in 2009 and one in 2013, it's 2021 people lol.