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NFC pairing failed!!! ble_nfc_pairing_reference test failed!

I use the following example source code to test NFC pairing.

Example source code for NFC:
nRF5_SDK_17.0.2_d674dde\nRF5_SDK_17.0.2_d674dde\examples\ble_peripheral\experimental\ble_nfc_pairing_reference

Android phone:
Samsung Galaxy S20 Ultra.

When I touch the Android phone to the NFC antenna of the nRF-52840-DK board, it is recognized and connected normally.
However, after about 20 seconds after NFC connection, the following message appears as a toast message on the Android phone.

Couldn't pair with Nordic_NFC_PAIR_REF.

Does this message indicate that the connection failed?

So I tried two more Android phones, and the same failure message appears after pairing.
Couldn't pair with Nordic_NFC_PAIR_REF.

All of the following NFC example sources will fail.
ble_app_hrs_nfc_pairing
ble_nfc_pairing_reference

About 20 seconds after pairing, a toast message appears on the Android phone.
Couldn't pair with Nordic_NFC_PAIR_REF.

How to solve it?

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