Let’s try to use Bitwarden’s terminology, to minimize miscommunication. You seem to be using the word “account” in a way that actually means subscription plan. In Bitwarden, an account is something your log in to, using your own email address, and your own master password. No one can join, be added to, or share a Bitwarden account.
However, Bitwarden offers multi-user subscription plans for organizations (e.g., families or companies), which allow multiple users to add their individual Bitwarden accounts to a common organization plan. This makes it possible for these users to create and use shared vault items, which belong to the organization and are stored in the organization’s vault.
By “personal”, I meant individual. The way that Bitwarden organization plans work is that each user has an individual Bitwarden account, with credentials (email address and master password) unique to that individual, and not used by anybody else. Users are then allowed to join the organization plan, giving them full or partial access to the organization vault, which contains shared items. However, while logged in to your individual account, you also have access to an individual vault (labeled “My Vault”), which contains items that are not shared with any other organization members.
To access the organization vault, you would first log in to your individual Bitwarden account. So, what I am trying to determine is whether you have your own individual Bitwarden account, that you log in to with your own email address as the username. When you were accessing Bitwarden last week, is that what you did (logged in to your account by typing in your email address and your master password)?
Do you recall anything about how you were “added” to the organization plan? Normally, you would create an individual Bitwarden account for yourself (a process that includes verification of your email address, by clicking a link in an email notification), followed by a multi-step process in which you are invited to join the organization plan, and your membership is confirmed after you accept the invitation (a process that involves you clicking a link in an invitation email). So my questions are: does any of this sound familiar, and if so, did you in fact receive the email notifications that were part of the initial sign-up and on-boarding processes?