Join a Group in Outlook

When you join a group, you gain access to the group mailbox and a group calendar. If the group is connected to a work or school account using a qualifying Microsoft 365 subscription, you also gain access to a OneNote notebook and team site. Permissions are taken care of automatically so you don't need to worry about missing any meetings or conversations.

Once you've joined a group you'll receive a welcome message that contains important information and links to help you get started. If the group is public, you'll get the message right away. If the group is private, you'll get the welcome message after you've been approved by a group owner.

Join a Group in new Outlook

1. From the navigation bar select  Groups icon Groups.
2. On the Group Home tab, select Discover Groups.
3. Enter a group name in the search box or scroll the list to find the one you want.
4. Select Join or Request to Join.
5. If the group is private, a request will be sent to the group's admin, who can accept or decline the request.
   

Join a Group in classic Outlook

In classic Outlook, from the navigation bar select More apps > Groups. (To pin, right-click Groups icon Groups and select Pin.)

From Groups Home you can see all your groups at once.

1. On the Home tab, select Browse Groups.
2. From the ribbon, select Browse Groups
3. Enter a group name in the search box or scroll the list to find the one you want.
4. Select Join.

If the group is private, a request will be sent to the group's admin, who can accept or decline the request.

Join a Group in classic Outlook from an email

1. If you receive an email message from a group that you're not a member of and decide to join the group, select Join on the group header in the right corner of the reading pane.
2. If the group is private, you'll see Request to Join instead, and will be asked to provide a reason for joining.
   
3. 
4. Request to join a group from an email
5. Wait for your request to go through, or for the group's admin to add you if you're trying to join a private group.
6. Once you've joined the group, you'll see detailed membership status as well as a shortcut to navigate to the group's inbox.
   

Join a Group in Outlook on the web

1. In the navigation pane, under Groups, select Discover groups.
2. In the search box, type a search term and press Enter.
3. Select Join if the group is public or Request to join if the group is private.
4. Once you've joined a group you'll receive a welcome message that contains important information and links to help you get started. If the group is public, you'll get the message right away. If the group is private, you'll get the welcome message after you've been approved by group owner.
   

Reference:

Join, leave, or follow Groups in Outlook - Microsoft Support

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