The missing private key is now available in Xcode.

Thank you. openssl req -x509 -sha256 -days 365 -key ALDencryption.key -in csr2048ALDEncrypt.certSigningRequest -out encryption-certificate.pem openssl req -x509 -sha256 -days 365 -key ALDencryption.key -in csr2048ALDSigning.certSigningRequest -out signing-certificate.pem openssl pkcs12 -export -out encryption-identity.p12 -inkey ALDencryption.key -in encryption-certificate.pem openssl pkcs12 -export -out signing-identity.p12 -inkey ALDsigning.key -in signing-certificate.pem

How? Using the Developer website? Or using Xcode? Because… I created new certificates on developer.apple.com "Certificates, Identifiers & Profiles", clicked the + symbol and uploaded a Certificate Signing Request using web form. https://developer.apple.com/help/account/certificates/create-a-certificate-signing-request/ What about the provisioning profile? Is it still valid? It didn't expire yet. Today I experience problems using codesign and productbuild.

It is intended to be a child process of the main app.