Plugin unlocking additional accounts & opening 1password app/website

BurningOutside:

The short version is that while 1Password is locked, it has no idea how many possible account passwords there are for the accounts added. The only way for 1Password to know how many accounts would be unlocked with a specific account password is to actually make an unlock attempt, and see how many accounts unlock. With that limitation in mind, there's no good way to unlock multiple accounts with unique account passwords in a single step. We do recommend when working with multiple 1Password accounts to use the same account password: How to use multiple accounts

As Roustem mentioned in the thread I linked, your account password being reused here is not the same as reusing a password elsewhere. Your account password is combined with the Secret Key, which is unique for every account. Both of these pieces combined are required to decrypt your data. They are known only to the account holder.

Additionally, with Windows Hello for 1Password for Windows, after all accounts have been unlocked with their account password at least once, Windows Hello will unlock all accounts at the same time until 1Password for Windows is closed.

Jack