NGINX says "client sent no required SSL certificate while reading client request headers" how do we troubleshoot?

NGINX says "client sent no required SSL certificate while reading client request headers" how do we troubleshoot?

ssl curl nginx client-certificates mutual-authentication

curl

OpenSSL error:02001002:system library:fopen:No such file or directory no key found, wrong pass phrase, or wrong file format, git bash vs cmd

python bash curl openssl mutual-authentication

curl

cUrl with mutual authentication

curl ssl-certificate mutual-authentication

curl

Https request with mutual authentication passes with curl but fails with java

java ssl curl mutual-authentication

curl