Hi there! I see you’re getting an "Authentication Failed" error in the Smart Closet app even after clearing the cache, restarting, uninstalling/reinstalling, and signing in with Google. Let me help you troubleshoot this further.

A few quick questions first to understand better:
- Are you sure you’re connected to a stable internet connection while trying to authenticate?
- Does the error appear immediately after entering your credentials, or after any multi-factor authentication step?
- Are you using any VPN or proxy that might interfere with your connection?
- Have you tried logging in with a different authentication method or a different Google account?

In the meantime, here’s a step-by-step approach you can try that goes a bit deeper:

1. Check Internet Connection:
Even if you’re connected, sometimes your device might have limited internet access. Try toggling airplane mode on and off or switching between Wi-Fi and mobile data.

2. Clear More Storage Data:
Along with the cache, try clearing the app’s storage/data to remove any corrupted files that might hinder login. On Android 10:
Settings > Apps > Smart Closet > Storage > Clear Data.

3. Check Date & Time Settings:
Incorrect date/time on your device can cause authentication issues with servers. Go to Settings > System > Date & Time, and enable “Automatic date & time” to sync with network.

4. Disable VPN or Proxy:
If you have any VPN or proxy running, disable it temporarily and retry login.

5. Review Google Account Permissions:
Sometimes the app needs explicit permission for access to your Google account. Go to your Google Account settings online > Security > Third-party app access, and make sure Smart Closet is allowed.

6. Try Login on Another Device:
See if your credentials work on a different device or browser to rule out account-related problems.

7. Update or Rollback App Version:
Ensure your app is updated to the latest version. If the problem started after an update, try installing an older version if available.

If these steps don’t work, the issue might be on the server-side or with your account configuration. You can email Smart Closet support directly at [email protected] for account-specific help.

Let me know how these steps go or if you want me to walk you through any of them! Are you satisfied with this solution so far?