Blocking or Unlock External User Teams
Block a person
There are a couple of ways you can block someone in Teams.
Block a person in the chat list
Select Chat to open the chat list.
Hover over the person's name, and then select More options > Block.
Block a person on their profile card
Hover over the person’s profile picture to open their profile card.
Select More options > Block contact.
Unblock a person
There are several ways you can unblock someone in Teams.
Unblock a person from the chat
Select Chat to open the chat list.
Select the chat with the person, and then select Unblock.
Unblock a person from the chat list
Select Chat to open the chat list.
Hover over the person's name, and then select More options > Unblock.
Unblock a person from their profile card
Hover over the person’s profile picture to open their profile card.
Select More options > Unblock contact.
Unblock a person from settings
Select Settings and more next to your profile picture.
Select Settings.
Select Privacy. Under Blocked contacts, select Edit blocked contacts.
Find the person you’d like to unblock, and then select Unblock.