Server-side Key Gen : How to pass CSR from ./estclient -y option ?

[devan555]

Hello Team,
I am trying the server-side keygen option from libest client to libest server
It works fine when I pass common name in the request.
./estclient -v -q -s 127.0.0.1 -p 8085 -o /tmp -u estuser -h estpwd -x /key-x-x.pem --common-name client02

I need to pass csr as the input, in rfc7030 I can see, it can support csr also as the input.

I tried below command
./estclient -v -q -s 127.0.0.1 -p 8085 -u estuser -h estpwd -o /tmp -y /enrollment.csr -x /enrollment.key
and getting the error Error:

The -x option (private key for CSR) does not make sense with a pre-defined CSR

When I tried without private key
./estclient -v -q -s 127.0.0.1 -p 8085 -u estuser -h estpwd -o /tmp -y /enrollment.csr
It says

Server-side key generation and simple enrollment without server-defined attributes failed with code 4 (EST_ERR_NO_KEY)

How I can pass csr for server-side key keygen ? Can anyone help me on that?