'az login issue to use azure commandline interface

I am using azure command line interface in my linux machine to run an image with azure container instance.
I am facing issue to login using az login command. I understood that the issue is because i am working behind corporate proxy and i tried appending certificates into cacert.pem file. But the issue is not resolved. I guess i might be doing something wrong which i am not able to identify. See the error in the screen short. Please suggest me which CA certificate i have to add to cacert.pem file and how to get the certificate. Thanks in advance!

Command used: az login
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