Apple iPhone X Production Woe Sparked by a Parts Imbalance

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BEIJING—Apple Inc. hit a production snag with components crucial to its new iPhone X’s facial-recognition system, people familiar with the situation said, adding to concerns about extended shortages when sales begin early in November.

The components, known as Romeo and Juliet among Apple engineers and suppliers, work together to allow users of the latest iPhone to unlock their devices by scanning their faces, the people said. It has taken more time to assemble the Romeo modules than the Juliet modules, they said, creating…