Problems with disconnection after pairing on IOS Mobile

Hello, we have built a BLE device based on the 52840 chip and the nRF5_SDK_17.0.2_d674dde\examples\ble_peripheral\ble_app_hids_mouse example architecture.
We have built a BLE device to connect to the transmission device, and the APP can search the device normally on Android platform, but there is a problem with the connection in iOS system.
The APP under IOS can search the device built by 52840, but it will disconnect after the pairing confirmation, I would like to ask how to solve this kind of problem.

The following information is for mobile:
iOS version: 17.5.1
Development Platform: HBuildX Vue3

Here's a screenshot of the SEC's setup.

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