Hi @Tyler_K,
First, it depends on whether you set yourself up with a Workspace or an Organization.
If you have an organization, which means you used a work email address with your company’s email domain, then if you co-workers join using emails with that same domain, they will be full members, not guests. The only way they will be guests is if they join using an email at a different domain. In other words, you can’t choose to invite someone as a full member or a guest; it’s determined by their email address domain.
If you have a workspace, then there is no such thing as a guest. There are Full Members and Limited Access Members, and you can choose which one to invite someone as . However, you’ll pay for a user regardless of which type they are, so from a cost standpoint it doesn’t help to invite someone as a Limited Access Member.
All of the above assumes you have a paid plan. If you are jsut using a Free version of Asana, then you’ll have a workspace, not an organization, and it has an upper limit of 15 users (Full Members or Limited Access, it doesn’t matter).
Aside from the above, here are a few more relevant links: