openssl s_server without PSK/certificate, but with client certificate validation

Is it possible to use openSSL without encryption and without a certificate at the server, but with validation of the client certificate? I’m not sure which cipher allows this (or where to get this info). I tried the following:

server:

openssl s_server -cipher NULL-SHA256 -nocert -CAfile client_cert.pem -Verify 4 -verify_return_error  -accept 44330 -www   

client:

openssl s_client -cipher NULL-SHA256 -cert client_cert.pem -key client_key.pem  -connect 10.10.1.87:44330 

But I’m getting errors at the server and at the client:

server error:

4699434604:error:140270C1:SSL routines:ACCEPT_SR_CLNT_HELLO_C:no shared cipher:/BuildRoot/Library/Caches/com.apple.xbs/Sources/libressl/libressl-47.11.1/libressl-2.8/ssl/ssl_srvr.c:1115: ACCEPT 

client error:

CONNECTED(00000003) 4447727212:error:14004410:SSL routines:CONNECT_CR_SRVR_HELLO:sslv3 alert handshake failure:/BuildRoot/Library/Caches/com.apple.xbs/Sources/libressl/libressl-47.11.1/libressl-2.8/ssl/ssl_pkt.c:1200:SSL alert number 40 4447727212:error:140040E5:SSL routines:CONNECT_CR_SRVR_HELLO:ssl handshake failure:/BuildRoot/Library/Caches/com.apple.xbs/Sources/libressl/libressl-47.11.1/libressl-2.8/ssl/ssl_pkt.c:585: --- no peer certificate available --- No client certificate CA names sent --- SSL handshake has read 7 bytes and written 0 bytes --- New, (NONE), Cipher is (NONE) Secure Renegotiation IS NOT supported Compression: NONE Expansion: NONE No ALPN negotiated SSL-Session:     Protocol  : TLSv1.2     Cipher    : 0000     Session-ID:     Session-ID-ctx:     Master-Key:     Start Time: 1582732375     Timeout   : 7200 (sec)     Verify return code: 0 (ok) ---