In Microsoft Teams only a Team owner can add/remove members. Members can submit a request which will go to the owner for approval.
To add members to a team:
If you're a team owner, go to the team name in the teams list and click More options > Add member.
Start typing a name, distribution list, security group, or Microsoft 365 group to add to your team.
When you're done adding members, select Add. Fyi, you can make someone a team owner by selecting the down arrow next to the word Member. There can be multiple owners in a team.
Select Close. People you add to a team will receive an email letting them know they are now a member of your team and the team will show up in their teams list.
To remove members from a team:
- Go to the team name and then click More options > Manage team > Members.
- From your team member list, click the X to the far right of the name of the person you'd like to remove.
- To remove another team owner, first change their role from owner to member, then remove them.
- Once you remove someone from a team, you can always use Add member to add them back to the team later on.