Certificate added but It shows missing private key

Question

Right now I'm developing apps on a brand new macbook. I have downloaded the certSigninRequest

Now I have added both the ios distribution certificate and the private key which is (certSigninRequest)

But whenever I try to export my app it keeps saying missing private key. I have added to my Keychain already

How did you export it? did you select *both* of the files when exporting it? — Ahmad F, Nov 05 '17 at 07:58
I download one from the ios distribution from apple developer website and the private key from my email, and just simply add them — sinusGob, Nov 05 '17 at 08:01
You have to export it from the current running machine that the certificate is active on it and then use it on the other one(s)... — Ahmad F, Nov 05 '17 at 08:05
You need export the p12 file and import it in your new macbook — Reinier Melian, Nov 05 '17 at 08:08
Can I export it on my current machine and click the p12 file again? — sinusGob, Nov 05 '17 at 08:09

Ahmad F · Answer 1 · 2017-11-05T08:57:25.700

For your case, the appropriate way to use the Distribution Certificate to be legal on other machine(s) is to export it from the current machine that uses the certificate.

To do this:

Navigate the the keychain access.
Go to the targeted certificate, expand it and select both the certificate and the private key:

Right click and select "Export 2 items...".
Obviously, you should fill the required info, such as the name of the exported file and a password.

The output of the above steps would be a .p12 file, which should be installed on the other machine(s). Note that revoking the original certificate will also makes this exported file to be invalid.

Do not request a new distribution certificate for the new machine, it will automatically revoke the previous one (which leads to make the first machine's certificate to be invalid). This thing is you would generate only one Distribution Certificate -by generating a "CertificateSigningRequest" file from the current machine- and then export it to be able to install it on the other machines, which means that all machines use the same distribution certificate.

Also, the following questions might be related to your case:

Certificate added but It shows missing private key

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