OneNote Sync issue

[maxwell2k19]

Hi Experts
One of my office365 user is facing issue with onenote, his onenote is not syncing, the user is getting the below message.
OneNote can't connect to the network, we will try sync your notes when the network is available
The user doesn't have any issue with one drive or outlook or owa. experts guide me on this 

[#2 · Accepted solution]

@maxwell2k19 

Your notebook is most likely stored on OneDrive, SharePoint or a local network location. When OneNote can't access these locations, it could be because of any of the following reasons:

• You may be experiencing intermittent, temporary network or server connectivity issues. Wait a few minutes and try syncing your notebooks manually. You can do this by pressing SHIFT+F9 or clicking the Sync Nowbutton in the Notebook Sync Status dialog box.
• The server where your notebooks are stored has gone offline temporarily. If you’re syncing to a SharePoint site or a local network share in your organization, someone may have turned the machine off or taken it down for maintenance. Check to see if you can access the root address of the server to verify the outage, or talk to your SharePoint or IT administrator to confirm or report the issue.
• Your notebook no longer exists at the network location. This could happen if you (or someone else with permissions to your notebook) deleted the notebook file from the server. If your notebook is stored on OneDrive for business, go to the OneDrive home page, log in (if prompted), and then check to see if your notebook still exists. If you’re unsure about where your notebook is stored, go to File > Info in OneNote 2013 to find the address of your notebook.

[#3]

@Akshay_Mane 

Spoiler

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@Akshay_Mane wrote:

• Your notebook no longer exists at the network location. This could happen if you (or someone else with permissions to your notebook) deleted the notebook file from the server. If your notebook is stored on OneDrive for business, go to the OneDrive home page, log in (if prompted), and then check to see if your notebook still exists. If you’re unsure about where your notebook is stored, go to File > Info in OneNote 2013 to find the address of your notebook.

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Official Microsoft website for OneDrive for business is here:

https://onedrive.live.com/about/en-us/business/

Not that 3rd party link embedded in your comment.