I work for multiple people who have different QB accounts and I want to work remotely for all of them but QB says my email (username) is already in use. Help!

You can signup for a QBO Accountant CA account with another email address to manage multi QBO CA accounts as an accountant firm.

Hello MarilynM. Just to add to the valuable info provided by Fiat above, here's a link that takes you to the site where you can sign up for a free QBOA account. Feel free to ask other questions, I'm here to steer you along the right path.