If you do not have a key identifier in https://developer.apple.com/account/ios/authkey , he can follow these steps to create it:
1) Go to the aka Member Center Developer Member> Certificates, Identifiers and Profiles> Keys / All> click the "+" button 
2) Enter a name and check the APN. The key is the same among your applications, so do not add the application name to the key name. Click Verify. 
3) Download the key and be careful with it. Here you can see the value of the key ID (baby). 
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