How to add a new user in Teams? – Docs

This procedure will explain you how to add a member or a guest. It will also explain which permission are granted depending on the granted accesses.

Difference between accesses.

Permission	Owner	Member	Guest
Dowload/Upload	X	X	X
Edit files	X	X	X
Create channel	X	X
Access to Settings	X
Add a member	X	(Invite)
Add a Guest	X
Grant access	X

Right click on the Channel you want to add the user to.
Click on Add members
Enter the name (for members) or the email address (for a guest) of the user
Click on Add
The user is now added! He might need to log off and log in to see the new Teams or Channel.

To add a person to a private channel, the person have to be added as a Member of the Teams before.

To approve an invitation from a member

Right click on the Teams
A tab will show up as Pending Requests (not displayed if there are no requests)
Click on Approve or Deny based on your needs