According to Wikipedia, a community of practice is a group of people who share a concern or a passion for something they do and learn how to do it better as they interact regularly.
On social impact teams, the mission is your "common passion", and organizational culture, professional development skills, and leadership skills are "learning how to do it better as you interact regularly".
Viewing your team as a community of practice - in the relational "how" you do your work in addition to the strategic "what" you do in your work - can support you to give better feedback, receive feedback more gracefully, navigate conflict more effectively, and listen better when cultural differences arise.