Can't find private key for Apple Development Push Services
My problem was that, for some reason the various certs were being added to the 'System' keychain instead of the 'login' one.
By selecting 'login' and then adding them with the little '+' (next to the i) they've been added to the right place.
I noticed that the expand icon is actually visible when clicking on 'My Certificates' in the left menu (Keychain).
What I faced, when I was creating CSR file, I was putting Common Name with a space. And the certificates created by this CSR file were not showing expand arrow in the Keychain Access
After I made a new CDR File with a short common name and recreated certificates, it installed well and has a private key.
