Whenever you want to add a OneNote to a Template so that the Teams that use the Template Team also have the same OneNote, you need to be aware that you have to create a completly new OneNote and not use the default OneNote since the Teams Manager can't access it.
To do that you can open your Template Team and click on the "+" to create a new Tab...

...then click on "OneNote"...

...and then select "+ Create New Notebook" to create a new Notebook.

Now Enter a new Name for the OneNote and click on "Save"

Oh and don't forget to save the template again in the Teams Manager bevore using it.
