Server/Client certificate authentication

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My question: I have created the CA, Server and Client Certificates and trying to connect the HTTPS Endpoint using the server/client certificates.

I would like to install the server certificate in postman and have installed client certificate in the HTTPS Endpoint

How can I install the server certificate in postman so that when I post using HTTPS the authorization is valid.

Details (like screenshots):

How I found the problem:

I’ve already tried: