How can you change the email that's being used when you include --auth flag on start server command?

When I try to start the local server with a website I am getting not authorized when the server starts. The website I was given permission for is with my work email but when I run the start server command it uses my personal email ( from my personal squarespace account). How can I switch to my work email? Thanks!

You may have figured it out already, but you can reset the server by going into the account through which the server is currently authenticated (in your case, your personal Squarespace account) and removing the authentication under Account Settings >> Account and security >> Connected apps. You can then re-authenticate the server after logging out of your personal account in the browser.