If you remove a member of a team, they are removed from the Microsoft 365 group as well. Removal from the group immediately removes the team and channels from the Teams client. If you remove a person from a group using the Microsoft 365 admin center, they will no longer have access to the other collaborative aspects such as SharePoint Online document library, Viva Engage group, or shared OneNote. However, they will still have access to the team's chat functionality for approximately two hours.