Exporting a client certificate on macOS
From SNIC Documentation
Safari and Chrome on uses the infrastructure present in the macOS (previously named OS X) operating system for certificate storage and retrieval, so in order to export a certificate you need to use the Keychain Access interface to manipulate and export certificates.
- Launch Keychain Access, select the certificate to export.
- In the context menu, select Export.
- Enter a name for the certificate file and select a location for it. Ensure that the File Format is Personal Information Exchange (.p12).
- Enter and remember a password to protect the file with, you'll need this to access it later.