Groups created in Microsoft Teams, SharePoint, Stream, etc. ((team) * hereinafter referred to as groups) are automatically created in each Microsoft 365 app as Microsoft 365 groups.
For example, a group created in Teams is automatically created on SharePoint and Stream. (* It takes time to create)

Notes.

• It will take some time for Microsoft 365 to automatically create them in each app.
  For example, if you create a new group in Teams, that group has not created in Stream etc. immediately after it is created.
  *It will take 2 to 3 hours at the earliest. Or more.
• A group or site created from Stream or SharePoint can also work as a Teams group by taking the following actions.
  (1)Access with https://o365tsukuba.sharepoint.com/sites/group ID/
  *The group ID is the part of the group email address before @ that can be confirmed from the group edit screen.
  (2)Go to the SharePoint site for that group and select Add Microsoft Teams.
  (3)Then the group will be displayed on Teams as well.
• It may be possible to create a group name with the same name from Teams and Steam respectively. (By changing the group email address, the part before @)
• If you delete a group from Teams, SharePoint, or Stream, the group will also be deleted from all apps on Microsoft 365.

Referring to external site)

• Learn about Microsoft 365 Groups
• Create a Teams group
• Create a Stream group
• Create a SharePoint group

* The above is based on the information as of March 2022.