Xbox controller doesn't connect to iPhone XS?

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- in Xbox
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My Elite 2 controller does not connect to my iPhone XS (IOS 13.5). It is not shown in the list of Bluetooth devices. However, it is possible on other devices, what could be the reason?

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The XBox controller can also not be connected to the iPhone, even on the PC I have a USB adapter for it, although my PC can also use Bluetooth.

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But it worked on the PC