Add OneNote in Sharepoint Site Grp
Go to the Microsoft Teams
Click on Teams icon that is on the left.
Select the GRP-IT Happenings Group, follow the below Steps to add OneNote.
In the dropdown Menu select Documentation
Click on Files and Select your team folder.
Once you are in your team folder.
Click on the dropdown list and select OneNote Notebook to add.
It will be added to your Team folder.