Add members to a team in Teams
If you're a team owner, you can add someone to a team. If you're not a team owner, you can submit a request and the team owner can then accept or deny it.
This topic is about adding members who are already a part of your team's org. If you want to add someone who's not a part of your org, see Add guests to a team.
Add members to a team
For the latest limit on team sizes, see Limits and specifications for Microsoft Teams.
Note: If you're a global admin, consider creating an org-wide team that automatically adds everyone in your organization.
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If you're a team owner, go to the team name in the teams list and click More options
> Add member.
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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 guests by typing 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.
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Select Close. People that you add to a team will receive an email letting them know they are now a member and the team will appear in their teams list.
Related links
Create a channel
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. If you're not a team owner, you can submit a request and the team owner can accept or deny it.
To add members to a team:
As a team owner, tap Teams 
and go to the team name. Tap More options > Add members. Then type the person's name.
If you want to add multiple people to an existing team, go to the desktop or web app.
A team can hold up to 5000 people.
If you're a team owner, you can add a team member to a team. If you're not a team owner, you can submit a request and the team owner can accept or deny it.
To add members to a team:
As a team owner, tap Teams and go to the team name. Tap More options 
> Manage members. Choose Add member 
and type the person's name.
If you want to add multiple people to an existing team, go to the desktop or web app.
A team can hold up to 5000 people.
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