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hey you not specified your error type that which error you get to connecting one note. If your one note opening correctly but backup or restore is not correctly then visit to following link<br />
<a href="https://support.office.com/en-my/article/Fix-issues-when-you-can-t-sync-OneNote-299495ef-66d1-448f-90c1-b785a6968d45" rel="ugc">https://support.office.com/en-my/article/Fix-issues-when-you-can-t-sync-OneNote-299495ef-66d1-448f-90c1-b785a6968d45</a><br />
<br />
If your one note is not working and having quota errors or share point errors follow the below link<br />
<a href="https://support.office.com/en-us/article/Troubleshoot-errors-in-OneNote-40976dfa-818f-4e5f-b8fb-b0fbb9bf785a" rel="ugc">https://support.office.com/en-us/article/Troubleshoot-errors-in-OneNote-40976dfa-818f-4e5f-b8fb-b0fbb9bf785a</a>
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hey you not specified your error type that which error you get to connecting one note. If your one note opening correctly but backup or restore is not correctly then visit to following link
https://support.office.com/en-my/article/Fix-issues-when-you-can-t-sync-OneNote-299495ef-66d1-448f-90c1-b785a6968d45 [https://support.office.com/en-my/article/Fix-issues-when-you-can-t-sync-OneNote-299495ef-66d1-448f-90c1-b785a6968d45]

If your one note is not working and having quota errors or share point errors follow the below link
https://support.office.com/en-us/article/Troubleshoot-errors-in-OneNote-40976dfa-818f-4e5f-b8fb-b0fbb9bf785a [https://support.office.com/en-us/article/Troubleshoot-errors-in-OneNote-40976dfa-818f-4e5f-b8fb-b0fbb9bf785a]

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The answer offered by another user did no answer my question.
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The answer offered by another user did no answer my question.

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Hi as a company we use Office 365. I can add on to the 365 portal with no issues, my Word and Excel programs are linked to my OneDrive. Again with no issues. <br />
<br />
However, I cannot connect OneNote. One Note will not accept my credentials!<br />
<br />
Any suggestions how to correct the issue.
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Hi as a company we use Office 365. I can add on to the 365 portal with no issues, my Word and Excel programs are linked to my OneDrive. Again with no issues. 

However, I cannot connect OneNote. One Note will not accept my credentials!

Any suggestions how to correct the issue.

Office 365 Login Issues

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.

Microsoft 365

Microsoft OneNote is a computer program for free-form information gathering and multi-user collaboration. It gathers users' notes (handwritten or typed), drawings, screen clippings, and audio commentaries into one program.