Let me share some information on how QuickBooks handles new users, @userdavid1.

Depending on the role of your new user, you'd have to enter their First name, Last Name, and their email address.

Once completed, they'd received an email invitation. From there, they'd have to click the Let's go link to create their own Intuit login credentials. 

They'll be routed to the page where they can set up their account's information and password.

If they're not asked to create a new password, it's possible that the system was able to detect an existing Intuit or QuickBooks account. Once they click on the Let's go link on the invitation,  they'd be routed to the Sign In page.

Also, if you're not quite sure about your old login credentials, you can click on the reset password link. You can read through this article for more detailed steps: Reset your password or recover your user ID for QuickBooks Online.

Swing by here if you have other questions or concerns about the authorized users in your QuickBooks account. I'm always here to help.