When the provider tells you "one password for everything" that also means it affected everything.

QB uses two steps: Your Intuit ID (the same as what you log into for this forum and the other programs) and then each data file has a username-password management scheme.

Also, for QB help, that community is at this other link:

https://quickbooks.intuit.com/learn-support/us-quickbooks-community/misc/03/community-us

You might want to bookmark it.