Hello,
Thank you for checking the Community.
As you are part of a Teams account, you need to add users via the admin console. Please, check the article: Add users to LastPass Teams
If the user has an existing account, they need to accept the invitation to be part of the company.
If you are experiencing issues with a specific user, please, submit a case for our tech support team, they'll be able to check the details of the account.
Thank you,
Karol | Customer Care