I had the same problem.
I was helped by the third step from this site: https://blogs.msdn.microsoft.com/dsn…oes-not-exist/
The problem is that when importing a certificate, UE4 launches iPhonePackager on behalf of the current user. If the user does not have administrator rights, then he cannot write the keys to the folder C:\ProgramData\Microsoft\Crypto\RSA\MachineKeys.
You need to provide full access to that user on the folder “C:\ProgramData\Microsoft\Crypto\RSA\MachineKeys”.
After that you need to reimport the certificate.
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