It may be due to a number of reasons, it is recommended that you try the following:
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1. Please check whether the back center of the phone is placed in the center of the wireless charging board.
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2. When there are inclusions between the mobile phone and the wireless charging board, it may not be able to charge normally.
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3. Check the back of the phone. If the protective phone cover used is too thick may hinder wireless charging, it is recommended to remove the phone cover and try to recharge
Because the iPhone has a battery protection feature.