This is a sample email notification notifying you've been granted access to the EPM instance, as you can see there is just a direct link to the login page but no temporary password.
This is a sample email notification with a temporary password.
Well, this is happening because of Single Sign-On configuration is on, which means you must select the "Maintain Identity Domain Credentials" when you create the new user if the user is not part of the Identify Provider domain.
That's it, quick and easy!
Hope this helps.