Account Id
This will be the unique name by which your account will be known in the system. It must contain no spaces and cannot be changed once it has been set.
The Account Id Name must be between 2 and 64 characters long with no spaces. Only letters and numbers, underscore (_), hyphen (-) and dot (.) are allowed.
Practice name
Practice name is required and has to be between 2 and 128 characters long.