Previously, I had a Free team where I was able to create at least one FigJam file within a project and allow my partner to edit it. After upgrading the team to the Professional level, I selected one seat in Figma (for myself) and nothing for FigJam, hoping that I would still be able to edit my single FigJam Board. However, when I later tried to open the existing FigJam, I was asked to purchase an additional paid seat for FigJam.
It turns out that in a Starter Team, I can access FigJam Starter Team features, but in a Professional Team, I can’t use FigJam at all. Maybe I’m missing something, but doesn’t this seem a bit strange?