forgotten vault pw

It would be helpful, if you can please let us know on which Platform you are using Norton Password Manager, is it Desktop (Browser extension) or on your Mobile ?

If you are using Norton Password Manager on your Mobile, then please follow the steps mentioned in the below document.  (credit viveksu)
https://support.norton.com/sp/en/us/home/current/solutions/v135002142

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Note: Norton does not know your vault password. 

Note: When you delete a vault, all of the Password Manager data that are stored in the vault is permanently removed.  If you think that you may use your vault data at a later time, do not delete your vault.

• Do you know your vault password?
• Do you want to delete your vault and start over...using your same Norton account Sign In?  

Note: When you delete a vault, all data stored in the vault is permanently removed.

• Do you know your vault password? 
• Do you see 'Open vault'? 
• Do you see 'Sign out'? 

• Maybe, try reinstall Norton Password Manager extension.
• Maybe, try vault password with VPN off. 
• Maybe, try vault password from another browser. 
• Maybe, try vault password from another device. 
• Maybe, try Sign In and vault password here -> https://my.norton.com/extspa/passwordmanager

Norton Password Manager 
To use Password Manager, you will need to create a vault. The vault requires its own password. We do not store or keep your vault password so if you lose your vault password, we cannot recover it for you. It is your sole responsibility to remember and keep your vault password. You may then use your vault to store your logins, passwords and login URL’s for other sites you access and use.
https://www.nortonlifelock.com/us/en/legal/license-services-agreement/#password(link is external)

Note: If yo​​​​u previously set up Mobile Unlock feature for your vault...you may be able to use that to unlock your vault.

Set up Mobile Unlock for Norton Password Manager
The Mobile Unlock feature lets you unlock your Password Manager vault using a desktop browser by approving a notification on your mobile device. Each time you launch your desktop browser with the Norton Password Manager extension installed, a vault unlock request notification is automatically sent to your registered mobile device. Once you approve the unlock request on the mobile device, your vault automatically unlocks in the browser.

To know more about the Mobile Unlock feature in Norton Password Manager, see Learn more about Mobile Unlock in Norton Password Manager

If you have forgotten your vault password, you can reset it from your Norton Password Manager mobile app. To know more on how to reset the vault password, see Reset vault password of Norton Password Manager from your mobile device

https://support.norton.com/sp/en/us/home/current/solutions/v128979256 

• Do you know your vault password?
• Do you want to delete your vault and start over...using your same Norton account Sign In?  

Note: When you delete a vault, all data stored in the vault is permanently removed.

If you want to delete your vault.  Please type a different incorrect (any characters) password three times.
for example: type 123 ... Enter > 456 ... Enter > 789 ... Enter 

Note: When you delete a vault, all of the Password Manager data that are stored in the vault is permanently removed.  If you think that you may use your vault data at a later time, do not delete your vault.