It sounds like you've gone through the initial setup process correctly, but you're encountering an issue with verification. One thing you could try is to ensure both devices have Bluetooth and Wi-Fi turned on, as Samsung Flow uses both for communication. Additionally, make sure that both devices are connected to the same Wi-Fi network. If the issue persists, you might want to try restarting both devices and attempting the setup again. If none of these steps work, reaching out to Samsung support could provide further assistance.