I am having trouble exporting my .cer file from apple to a .p12 file in Keychain Access, I can only export it as a .p7b. Does anyone know how I can solve the problem?
Locate the the valid developer certificate in Keychain Access from your My Certificates section. Once you see your certificate listed in the window, click on the arrow to drop down and show your private key associated with that certificate. Right-click and select Export. Once the dialog box comes up, it should default to .p12 extension. If not, just change it to .p12.
Hope that works for you!
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