Hi there! I'm here to help you with the registration issue you're experiencing with DayBand. Let's dig a bit deeper so we can figure this out together.

Could you let me know if you're encountering any specific error messages aside from "registration failed"? Also, are you using the DayBand app or the website for registration? Any details would be really helpful!

The app

Thanks for the details! Since you're using the DayBand app, let's try a few troubleshooting steps to resolve the registration failed issue.

1. Check Internet Connection: Ensure that your device is connected to the internet. You might want to test your connection by browsing another app or webpage.

2. App Update: Make sure you have the latest version of the DayBand app. You can check for updates in the app store where you downloaded it (Google Play Store or Apple App Store).

3. Clear App Cache (if applicable): If you're on Android, go to Settings > Apps > DayBand > Storage > Clear Cache. For iOS, you may need to uninstall and reinstall the app to clear the cache.

4. Correct Information: Double-check that you’re entering all the required information accurately. Sometimes an incorrect email format or password can cause this issue.

5. Try a Different Email Address: If you're using an email address that may already be associated with a different account, consider trying a different email to create the account.

6. Check for Notifications: Sometimes there may be important notifications from the app that could indicate what's wrong. Look for any prompts or error messages.

If you’ve tried these steps and are still unable to register, the issue may require further investigation. I can look up additional resources if necessary. Just let me know how it goes!