Does the Channel Sounding have regional restrictions by country?

I'm trying to get the new Bluetooth Channel Sounding distance measurement working between an iPhone 17 running iOS 27 Beta4 and a Nordic nRF54L15DK board.

• I enabled bonding in the latest ipt_reflector sample from Nordic. Someone get the sample working with iOS 27 beta1.
• I paired the board with AccessorySetupKit.

I suspect that the Channel Sounding feature is subject to regional restrictions by country (China).

Here's the code to check if CS is available on my iPhone

func centralManagerDidUpdateState(_ central: CBCentralManager) {
        switch central.state {
        case .poweredOn:
            print("central update")
            if CBCentralManager.supports(.channelSounding) {
                print("Supports channel sounding - YES")
            } else {
                print("Supports channel sounding - NO")
            }
            if let id = pendingPeripheralIdentifier, let name = pendingPeripheralName {
                pendingPeripheralIdentifier = nil
                pendingPeripheralName = nil
                retrieveAndConnect(identifier: id, name: name)
            }
        case .poweredOff:   connectionState = .bluetoothOff
        case .unauthorized: connectionState = .error("Bluetooth not authorized — check Settings")
        case .unsupported:  connectionState = .error("BLE not supported on this device")
        default:            break
        }
}

The console log shows

[ASK] Session activated — accessories: 1
central update
Supports channel sounding - NO
[CS] startChannelSounding skipped — channelSounding not supported

Please also check the topic. it's very similar.