If your OneNote is having syncing issues, please try the following steps:
-Make sure you are logged into OneDrive and that it is not paused
-In the bottom right of your computer, you should see a blue cloud icon:
-If you do not see this icon click the ^ button to see more icons .
-If this cloud icon is grey, has a pause button on it, or has an X on it, you are not properly connected to OneDrive and your programs will not sync.
-If you see one of these symbols, click on it, and in the box that pops up, login to your OneDrive with your school email address and password.
-Force sync your OneNote notebook
If you are properly connected to your OneDrive, try forcing a sync on your OneNote notebook.
-Right-click on the notebook that you are having issues with and click on Sync >
-Click Sync This Notebook or if you are having issues with multiple notebooks click Sync All Notebooks.
-Give OneNote some time to sync and see if the syncing issue is resolved.
-Close and Re-Open a Notebook
If you continue to have issues after the above steps are tried, you can attempt to close and re-open a notebook with syncing issues.
-Right click on the notebook having issues and click "Close This Notebook"

-Once the notebook has closed, click the "More Notebooks..." button at the bottom of your notebook list. Find the notebook you closed in the window that appears, click the box next to it to select the notebook, and click "Open" in the bottom right.
-Check office.com to see if the sync issue is also happening there
-When you login and get to the dashboard, open OneNote
-Find the notebook you were having sync issues with and see if the issue is happening online as well
-If the sync issue is not happening online, use the online version of OneNote in the interim and bring your computer to Room 1105 when you are at school to have your OneNote app fixed
-Restart your computer
If none of the previous steps helped, please run updates on your computer and restart the computer