Hello! It sounds like you're encountering the HT_556 error code with your MyHyundai with Bluelink. This usually happens when there's an issue with remote start or climate control, often triggered by a door being open or unlocked.

Let’s go through a few steps to resolve this issue:

1. Check Your Doors: Ensure all doors, including the trunk, are completely closed and locked. Sometimes, if even one door is slightly ajar, it can trigger this error.

2. Try Remote Start Again: After checking the doors, attempt the remote start function using your Bluelink app once more.

3. Reset the System:
- If the issue persists, try resetting your vehicle’s infotainment system. You can do this by finding the reset pinhole near the CD on the radio; you’ll need a small, sharp object to press it. Make sure your vehicle is on before doing this.

4. Vehicle Settings: Go to “Settings” on your vehicle touchscreen, and check under “Data/Network” or “Bluelink” settings to ensure everything appears correctly configured.

5. Network Connection: Make sure that your vehicle has a strong cellular connection as this can affect the functionality of the Bluelink features.

If you’ve tried all these steps and are still facing the HT_556 code, I would recommend reaching out to Hyundai customer service for further assistance. They can perform more advanced diagnostics on your vehicle.

Are you satisfied with the solution I provided, or do you need to explore more options?