Can't create CSR from private certificate. An Error Occurred. The specified item could not be found in the keychain
As described in this solution, you can use openssl to generate .csr file.
Error to Request a Certificate From a Certificate Authority on Mac Keychain Access
I solved it!
On Keychain Access > Keychains > login was unlocked, I locked it and tried again and it worked.
I hope be useful
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