Need help in Setting download client for single sign on, on Linux 64 bit

it says

"caa started in foreground mode.
Connecting to host ...
Connected with ECDHE-RSA-AES256-GCM-SHA384 encryption.
Client type sent: Linux
Login was denied. Username/password invalid!
Sending SIGTERM to running caa with Process Id 96829.
Running instance of caa terminated by signal 15"

Even when my Username/password is correct. I don't know what to do

I am running Ubuntu 20.04 LTS version

Kernel Version: 5.11.0-41-generic

Please guide me how to setup this download client? If any other information is needed do ask!