is it possible to add team members for collaborating on a project that wasn't created as a team project?
You can convert the existing project to a Team Project by opening it, then using the menu function
Edit → Team Project → Convert Project to Team Project…
The new Team Project is a copy of the old project and is given the same name by default. You might want to change the name to make it easier to tell the two projects apart. You can add collaborators when you do this operation.
Great, thanks Christian!
I am not getting that as an option...it is grayed out.
Which version of Premiere are you using?
It works in Premiere. This is latest version of After Effects 22.214.171.124
For After Effects you need to import the project file into your open Team Project.