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About error code 4352

Hello.

In order to connect multiple units on the previous question page (https://devzone.nordicsemi.com/f/nordic-q-a/51970/implementing-multilinks-on-multiroll-programs), we were able to specify the array.
However, when I implemented the program, I got the following error:

peer_manager_handler: Connection security failed: role: Peripheral, conn_handle: 0x0, procedure: Bonding, error: 4352
Disconnected, reason 8

What are the possible causes for this “4352”?Thank you.

The environment is as follows.
SoftDevice: S132
IDE: SES
BLE Device: NRF52832
SDK version: 15.30
peripheral project: ble_peripheral⇒ble_app_hrs
multirole project: experimental⇒ble_app_multirole_lesc

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