There are some things to be aware of when considering adding Teams to your groups. Guest access is available, however, there are some limitations. Visit Microsoft's support page for additional information on guest access.

If you have an existing OneNote notebook in your group, the notebook is not visible from within Teams. You can only create new sections from within Teams and view existing and new sections of your notebook in the OneNote app directly or in the notebook of your group. You can access teams on a variety of platforms, but some browsers may provide a better experience like Firefox or Chrome.