Add members to a team in Microsoft Teams
Team owners can easily add someone who's already a part of their team's org to a team.
Add members to a team
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Go to the team name and select More options
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Start by typing a name, distribution list, security group, or a Microsoft 365 group. You can also add people outside your org as guestsby typing in their email addresses.
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When you're done adding members, select Add. You can make someone a team owner by selecting the down arrow next to Member. A team can have multiple owners. For more about roles and permissions, see Team owner and member capabilities in Teams.
For the latest limit on team sizes, see Limits and specifications for Microsoft Teams.
Notes:
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If you're not a team owner, you can submit a request and the team owner can then accept or deny it.
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Global admins can consider creating an org-wide team that automatically adds everyone in their organization.
Related Topics
Accept or deny requests to join a team Add guests to a team Create an org-wide team Team owner, member, and guest capabilities in Teams
If you're a team owner, you can add a team member to a team.
To add members to a team:
As a team owner, tap Teams 
Tip: Use the desktop or web app to add multiple people to an existing team.
If you're not a team owner, you can submit a request and the team owner can either accept or deny it.
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