Cer and pem Certificate Do Not Work

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I am running Postman Version 7.0.7 (7.0.7) on Mac OS X Mojave 10.14.4 (18E226).

The server is presenting a certificate chain rooted in “XXX CA”. I have added (at separate times and not together) both a CER and a PEM to Postman. I set the domain and port of the target server. I use the CER or PEM as both the certificate and the key. There is no password. I cannot connect to the server.

The PEM certificate is added to my OS X Keychain and I am able to connect successfully to the same server.

Please advise.

Here is the output I receive in Postman console:

Error: unable to get local issuer certificate

    • Request Headers:
      • Accept:“application/json”
      • Accept-Language:“en-US,en;q=0.8”
      • Content-Type:“application/json”
      • Pragma:“no-cache”
      • X-Requested-With:“Postman”
      • cache-control:“no-cache”

**** NEW ****

I generated a CRT from the “XXX CA” PEM. I then exported the public key for the PEM to a “KEY” file. This also resulted in the output above.