CAdES signature not working with pkcs11 engine

My operating system is EndeavourOS, so I use Arch Linux repos.
I would like to use openssl to create CMS Advanced Electronic Signatures 
(CAdES)
I have the certificates on an Italian smart card that is recognized by the 
system after installing:  
*pcsclite ccid opensc*
And in fact using the proprietary sw provided by the smartcard supplier I 
can successfully affix the CAdES signature.
To use openssl I installed:  
*libp11*
and added the following lines to /usr/lib/ssl/openssl.cnf
openssl_conf = openssl_init

[openssl_init]
engines = engine_section

[engine_section]
pkcs11 = pkcs11_section

[pkcs11_section]
engine_id = pkcs11
dynamic_path = /usr/lib/engines-3/pkcs11.so
MODULE_PATH = /usr/lib/onepin-opensc-pkcs11.so

Then I tried to sign with the same command that worked on ubuntu

openssl cms -nosmimecap -md sha256 -nodetach -binary -cades \
-stream -outform DER -sign -signer $cert_pem -inkey $ID \
-keyform engine -in "$infile" -out "$outfile" -engine pkcs11

where $ID is the ID of the key read from the smartcard using pkcs11-tool
while $cert_pem is obtained by converting the binary certificate extracted 
with pkcs11-tool.
Unfortunately I get the following output:

Engine "pkcs11" set.
Failed to enumerate slots
PKCS11_get_private_key returned NULL
Could not find private key of signing key from org.openssl.engine:pkcs11:01
806BDA451E730000:error:40000067:pkcs11 engine:ERR_ENG_error:invalid 
parameter:eng_back.c:699:
806BDA451E730000:error:13000080:engine 
routines:ENGINE_load_private_key:failed loading private 
key:crypto/engine/eng_pkey.c:79:

Thanks for any contribution towards the solution

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