OpenConnect-GUI doesn't connect to Cisco AnyConnect server.

Summary

for almost a year I've used "OpenConnect-GUI" to connect to my company office which uses Cisco AnyConnect server. but since last week it doesn't work anymore. when I'm connecting it keeps asking the password...

with "Cisco AnyConnect secure mobility client" the connection is fine and it works but because of reasons I have to use "OpenConnect" as client.

our office admin says he has not touched anything since last week 😆

Version of the software & operating system

-tried with different version of "OpenConnect-gui" and even the last one(v 1.6.0) from official website but no result. -os windows10

can anyone help me to have it working again please. if detailed info is needed let me know. thanks