If the Stanmore II Voice cannot be discovered by the Marshall Voice App, then the likely cause is that the speaker is not in setup mode.
Select Wi-Fi as the input mode. Push and hold the SOURCE button for three seconds to set the speaker in discoverable mode.
Alternatively, the speaker may not be discovered by the Marshall Voice App because the speaker and the mobile device are not connected to the same Wi-Fi network.
You should ensure that your mobile device is connected to the same Wi-Fi network that the speaker was configured on.
If you cannot troubleshoot your product or believe it to be faulty, please click here to submit a request or contact us via the live chat function in the bottom right corner.