Distribution certificate / private key not installed

Up to date (January 2021) (Xcode 10 – 12)

  1. Go to Xcode – Preferences – Accounts – Manage Certificates
  2. Click on the + at the bottom left, then Apple Distribution
  3. Wait a little, then click Done

That’s all.
You may want to revoke the old certificate on developer.apple.com too.

Old answer

Step 1: Xcode -> Product -> Archives ->
Click manage certificate

Click manage certificate

Step 2: Add iOS distribution

Add iOS distribution

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