Hi! I see that your Redkey vacuum is not showing up in the Tuya app. Let's work through this together and get your vacuum connected.

To start, could you tell me a bit more?
- Have you already tried to add the Redkey vacuum device through the app's "Add device" option?
- Is the vacuum powered on and in pairing mode (often indicated by a blinking light)?
- Are you connecting over a 2.4GHz Wi-Fi network? (Tuya devices usually don’t work with 5GHz Wi-Fi)

If you haven't already tried, here’s a simple step-by-step you can follow:

1. Reset the Vacuum: Press and hold the vacuum’s power button for about 5 seconds to reset it (if there is no separate reset button). This should put it back into pairing mode.
2. Open the Tuya Smart app: Make sure you are logged in and have the latest app version installed.
3. Add Device: In the app, tap the "+" or "Add Device" button and select the vacuum or “Robot Vacuum” category if available. Follow the prompts.
4. Wi-Fi Connection: Ensure your smartphone is also connected to the 2.4GHz band of your Wi-Fi network. Enter your Wi-Fi credentials in the app carefully.
5. Wait for Connection: The app should then find your vacuum on the network and pair with it.

Also, make sure your router’s firewall or filters aren’t blocking new devices from joining, and that your account is active and logged in the app.

If you’ve tried these already or the vacuum still doesn’t appear:
- Do you notice if the vacuum is showing any blinking lights or error codes?
- Have you tried uninstalling and reinstalling the Tuya app or restarting your phone?
- Is your firmware up to date for both vacuum and app?

Let me know what steps you’ve done already and any spotted indicators, and I can guide you further! If needed, I can also share a detailed Redkey setup guide.