Ok so I have found these three answers: This one Revoked Certificate by Apple this one Your iOS Development certificate has been revoked? and this one Certificate has either expired or has been revoked and I get the same problem (A email from apple) every time that I use Xcode on one of the macOS devices that I have and then switch over and use Xcode on one of the other macOS device or vice-versa. and I think I know what's going on according to the answer at Your iOS Development certificate has been revoked? but is there any way that I can stop this from happening every time that I switch and use Xcode on the other device without needing to go through the process explained here? Certificate has either expired or has been revoked
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so just a comment I think whats going on is that a new certificate is being generated every time switch devises is that correct? – Mikael Weiss Jan 19 '17 at 13:52
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you should create your own developpement certificate in your account and add all test devices you use – Marouane Lanouari Jan 19 '17 at 13:54
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you may need to share the `.p12` between the two computers. – holex Jan 19 '17 at 14:29
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you should create your own developpement certificate in your account and add all test devices you use.
but if you change your mac you should move certificate to the other mac or just create a new certificate for this mac.

Marouane Lanouari
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else your xcode will generate each time a new x.* certificate – Marouane Lanouari Jan 19 '17 at 13:56
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If you are changing your mac, you have to create the .p12 file from certificate and install that .p12 onto new mac. Then there will be no problem regarding that certificate.
If you are familiar with how to create .p12 file from certificate.
Please check this link for certificate :-
https://developer.apple.com/library/content/documentation/IDEs/Conceptual/AppDistributionGuide/MaintainingCertificates/MaintainingCertificates.html

Mandeep Singh
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Im not familiar with .p12 files or how to create a development certificate or add test devices any advice of where to go to find that out? – Mikael Weiss Jan 19 '17 at 18:40
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@MikaelWeiss Please check this link and you will find how to create developer certificate. – Mandeep Singh Jan 20 '17 at 04:55
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one last question am I required to be a paid developer to do all this? – Mikael Weiss Jan 30 '17 at 14:29
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No, But if you want to publish your app on the app store. Then you have to be a paid developer. – Mandeep Singh Jan 31 '17 at 04:25