'BlueZ missing RequestAuthorization

I have a Bluetooth client which implements an agent with NoInputNoOutput capabilities (using BlueZ version 5.54 in Linux).

When a new pairing occurs, I expect the agent to receive a RequestAuthorization dbus message, but this never arrives.

From the BlueZ agent-api documentation

void RequestAuthorization(object device)

This method gets called to request the user to authorize an incoming pairing attempt which would in other circumstances trigger the just-works model, or when the user plugged in a device that implements cable pairing. In the latter case, the device would not be connected to the adapter via Bluetooth yet.

      Possible errors: org.bluez.Error.Rejected
                       org.bluez.Error.Canceled

I have used dbus-monitor --system to check for the existence of the message but it's not there.

Can anyone suggest why this wouldn't be sent?

linuxbluez


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