Hello, I suggest you try the following three methods.
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First, check whether the magnetic charger itself is damaged, you can take other mobile phones to check. Or reboot the magnetic charger.
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Second, if the magnetic charger is no problem, see if the relevant Settings of the iPhone are open, and whether the option to allow external charging is allowed.
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But if the charger and phone Settings are no problem, it is recommended to go to the Apple store, or find a door-to-door repair master to help look