Pulse Secure VPN client gives "Unacceptable TLS certificate" error on Ubuntu 20.04

Hey everyone,

I am unable to connect to my org's VPN using pulse secure since yesterday. It gives "Unacceptable TLS certificate" when I press "Connect" on the Pulse Secure VPN client.

I am using Ubuntu 20.04 with the 9.1r9.0-b255 version of Pulse Secure.

What have I tried:

I opened the connection URL in the browser, exported the certificate from there, and put it in /usr/local/share/ca-certificates. Then I ran sudo update-ca-certificates --fresh
This fixed the "Unacceptable TLS certificate" and got me to the login screen on the VPN client but after entering the credentials, nothing happens. I cannot connect to the VPN. [Source]

I have also tried to reinstall the Pulse Secure VPN (same version as listed above) following instructions from here after deleting the /usr/local/pulse and ~/.pulse_secure directories, but the issue persists. [Also tried filling the form given here but never received the download link of the latest client]

What I found:

During my search, I also came across this r/sysadmin post which tells me that Windows users have had certificate problems recently. This link on that post tells that Linux users should not be facing any issues. I am not sure why is this happening and I am also not an expert in this field.

Could someone please help me out so that I can log in back to my org's VPN?

Thanks a lot.