This guide will help the expert add a OneNote notebook to Teams
2. Resolution
Open Microsoft Teams.
Click on Apps.
Click on OneNote.
Click the down-arrow button and select Add to a team or Add to a chat option.
Click the search box and specify the team to add OneNote.
Click the Set up a tab button.
Click the Create New Notebook option.
Confirm the name for the new notebook for the team.
You'll also notice an option to open an existing notebook using a link, but it's only supported for notebooks hosted in SharePoint or OneDrive for Business.
Select the newly created notebook
(Optional) Create new sections as needed.
(Optional) Clear the Post to the channel about this tab option.