By default, only the Teams Account Owner can invite other users to the Teams account. You can enable Admins to invite other users to join the account by following the steps below.
Step by step:
- Using a computer, log in to your Teams account.
- In the top right corner, click the account menu.
- Select Teams settings.
- On the left side of the page, click Account Settings.
- Next to Allow admins to invite users to this organization, click the toggle to turn it on ().
When this setting is enabled, Admins can invite additional users as Directors and Editors, but not as other Admins.