If you create a OneNote tab MS Teams always creates a new one. However there is a way to create a OneNote tab to a existing notebook.
- Create a new tab using “+“.
- Instead of selecting the “OneNote” tab select the “Website” tab.
- Fill in the “Tab name” eg: OneNote.
- Then go to OneNote online and copy the website address (URL) of the existing notebook.
- Now paste the website address into the URL field.
- Click “Save” and you’re done!