I start with Teams, create a new team some members some guests. Sometimes there is a proper duplicate in other apps, sometimes not and my contact and groups in outlook are always inconsistent.
To create a new team in Teams, you need to have a Microsoft 365 group first. You can create a group from Outlook, SharePoint, Planner, or other apps that support groups. Then, you can use the same group to create a team in Teams. This way, you can ensure that the group members and settings are consistent across different apps. For more information on how to create a Microsoft 365 group, you may refer to the article.
i also can't even include myself as the owner in a team in Teams.
To include yourself as the owner of a team in Teams, you need to be the owner of the corresponding Microsoft 365 group. You can check and change your role from the admin center or Outlook. For more information on how to change your role, you may refer to the article.
Hope the above information is helpful for you!
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.