How does Master Password work when adding new users from my Org?

Trying to use Vault for my team at my Org. I have setup my user account and master password and imported several hundred passwords. I have added user accounts for my 4 team members and shared the passwords with them.

When one of them accepts the invite and uses SSO to sign in with their O365 account, they are asked for the master password. Do they need to use the master password that I setup? That is not accepted. Do they need to create their own? They are not instructed to setup a master password of their own when they setup their account. How do they do this?

Confused. Thanks

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