I am on Windows 10, I have a .p12 file and when I try to import the .p12 file into the keychain tool the tool closes and nothing happens. Then when I try to build the Certification is not signed. I extracted the .cer and private key from the .p12 using openssl and added both files to the keychain tool. I have two privisioning profiles and when I select them the correct certificate is in the dropdown, but the associated private key is "not found". The only issue I have had so far is signing.