Hi Allison and welcome to the forum. Asana just rolled out a change with sections. Great news is that they are now fundamentally different than tasks which will allow for much better functionality in the future. However, they needed to change how the sections are created. Now the shortcut is Tab + N or using the Create Section button at the top of the list. Here is some more information about how sections have changed. Sections are dead! Long live sections!
I hope that helps,
Katie