Hi there! I see you're having trouble with your Stelo app saying your passkey is invalid. Let's get this sorted out together.

To start, could you tell me exactly where you're entering the passkey? Is it during the app login, sensor pairing, or another step? Also, have you recently changed your passkey or password? Knowing this will help tailor the solution better.

Meanwhile, here are some general steps to try for passkey or pairing issues on an Android device with the Stelo app:

1. Restart the Stelo app: Close the app completely and reopen it. Sometimes a fresh start clears temporary issues.
2. Check Bluetooth settings: Go to your Android device's Bluetooth settings and remove (forget) any previously paired "Dexcom" or Stelo devices, then try re-pairing.
3. Verify the passkey: Make sure you are entering the passkey exactly as provided, with correct capitalization and no extra spaces.
4. Check device region settings: Ensure your phone's region matches the one registered in your Stelo account—it can impact login or pairing.
5. Restart your phone: This can resolve connectivity glitches.
6. Update the app: Verify that the Stelo app is updated to the latest version from your app store.
7. Permissions check: Confirm the app has all necessary permissions, especially Bluetooth and location access, as Android requires location permissions for Bluetooth scanning.
8. Battery saver disabled: Make sure battery saver is off, as it can restrict Bluetooth functions.

If you've done these already, or if the problem happens specifically when entering a passkey at pairing, try these deeper steps:

- Delete the Stelo app and reinstall it fresh.
- Double-check the passkey from your sensor packaging or account portal.
- Clear the app’s cache via Android Settings > Apps > Stelo > Storage > Clear cache.
- If the sensor was paired with another device recently, ensure it's fully disconnected from that device.

Does any of this resonate with what you’ve tried? If you can share a bit more about when the message appears, I can assist you more precisely.

Are you able to give me those details?