If you also have other Microsoft Office apps for iOS (Word, Excel, PowerPoint, Outlook), you will need to update all of them.
To download the latest version of OneNote for iPhone and iPad, check the App Store for automatic updates. To learn more, see Check for updates in OneNote 2016 for Mac.
Update all of the Microsoft Office applications, since they all use the same keychain items. If you installed OneNote as part of Microsoft Office for Mac, then open OneNote, go to the Help > Check for Updates menu to launch the Microsoft AutoUpdate app and follow instructions there. You should see the option to update OneNote there.
If you've downloaded OneNote from the Mac App Store, launch the App Store and check for Updates. Please update to the latest version of OneNote for Mac, iPhone and iPad. Similarly, OneNote may require you to sign in repeatedly to resolve sync errors.
Removing office 365 desktop applications and then reinstall them from the download area of the web portal is a last resource but it definitely should resolve the OneNote sign in issue.If you use OneNote 2016 for Mac and OneNote for iPhone and iPad, you may be asked to sign in any time you open the OneNote app or when you switch between notebooks. If you are running a third party firewall application you should be able to allow OneNote connection. If you’re in a corporate environment, be sure to ask your network administrator to change this for you. To fix the problem, it’s advised to change your firewall settings and allow OneNote to go through your firewall. According to them, the firewall was blocking the connection to OneNote and caused this issue to occur. This is more of a workaround than a solution.Īfter reaching, several users online have reported that they are unable to sign in to OneNote due to their firewall settings. Select OneNote 2016 or any other version of OneNote that came with Microsoft Office.Īfter doing that, OneNote 2016 should open and you’ll be able to sign-in without any problems. Click on OpenNote at the top right corner and you’ll be offered to choose between all versions of OneNote installed on your PC.ģ. If everything works, it means that the problem is related to the desktop application.Ģ. The only other fixes I would recommend you try are the following:ġ. I'm sorry to hear none of these solutions have helped you. Where did you store the notebook, Personal OneDrive or OneDrive for Business? When did the issue occur? Which operation have you taken before the issue occurred, such as updating Office?Ĭheck if all notebooks meet the issue, you can open a new notebook to check the result.Īre you using a business/school or personal account? If the issue still exists, could you please provide the following information for further analysis? Open the notebook on OneNote online, then select Open in OneNote.īesides, here is an article about troubleshooting sync OneNote, you can refer to it: If you can open it on OneNote online, I suggest you reopen it to check the result:īackup the editing content which is not synced to prevent data losing. There were some issues earlier with azure AD accounts that have now been mitigated so your issue may have resolved itself.įor the sync issue, I suggest you open it on OneNote online to check the result.