![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(128, 8%, 22%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EC%3C/text%3E%3C/svg%3E)
Microsoft 365 and Office | Install, redeem, activate | For business | Windows
Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hi @Caroline
Welcome to Q&A forum ~
Does your notebooks stored on OneDrive?
If yes, I would like to suggest you open OneNote Online for a test.
Besides, please try the open the notebooks on OneDrive via right-cliking on them and choose Open > Open in app > Allow.
Then please click Apple icon > System Preferences > Network > Advanced > Proxies, make sure no option is ticked.
If it does not work, it's recommended to uninstall OneNote by moving OneNote icon to Trash.
Then download and install it back from Apple App store.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.