OneNote sync problem

Hi,

Did you get any error codes in the error message?

As you said you cannot open in the browser, did you get any error message?

I suggest you check if you can sign in other accounts in OneNote. If yes, please confirm if this problem account can sign in Office Portal: https://www.office.com/

I also suggest you refer to this support article to get more information:

https://support.microsoft.com/en-us/office/fix-issues-when-you-can-t-sync-onenote-299495ef-66d1-448f-90c1-b785a6968d45

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