First prepare a certificate signing request that you will later upload to Apple's Developer Portal. Open 'Keychain Access' then select Keychain Access → Certificate ...
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how-to-change-signing-certificate-in-xcode
Mar 6, 2020 — A signing certificate consists of two things: ... After successfully setting up Development Certificates, export a backup copy and store them in a safe place. ... by Xcode — it may be necessary to update the device, Xcode or both. 939c2ea5af