Hi there! I understand your Norton Password Manager Vault is not opening on any of your devices. Let’s get this sorted out together.

To start off, could you tell me:
- Are you seeing any specific error messages when attempting to open the vault?
- Are you trying to open the vault through the browser extension, the Norton app, or both?
- Have you noticed if this started after a certain event, like a software update or password change?

Meanwhile, here’s a general step-by-step troubleshooting guide we can try:

1. Check your internet connection: Norton Password Manager needs an active internet connection to access your vault securely.

2. Run Norton File Cleanup and restart your PC: Sometimes leftover files or cache can cause access issues. Running File Cleanup clears those. You can find this tool in your Norton product under tasks or utilities. After running it, restart your Windows 10 device.

3. Update Norton Password Manager and your browser extension: Ensure both are up to date with the latest versions.

4. Try signing into the Norton Password Manager website directly: https://passwords.norton.com — if you can access your vault through the site, it helps narrow down if the issue is extension or device related.

5. Clear browser cache and cookies: This can fix issues where the vault is loading improperly.

6. Disable and re-enable the Norton extension: Sometimes toggling the extension off and back on can refresh connectivity.

7. Check for any Norton outages or server maintenance: Occasionally, backend issues can prevent vault access.

If these steps don’t help, there are a few more advanced troubleshooting options we can explore, like uninstalling and reinstalling the password manager or checking if passwordless unlock settings are causing any conflicts.

Let me know what you’ve tried so far or if you see any error codes/messages when opening the vault. This will help me guide you better!