Hi,
What kind of device did you use?
How did you get the shared OneNote?
I suggest you refer to these article about open shared OneNote:
If you get the shared OneNote from email, you can click the link directly. It will open the Notebook in the browser and you should sign in the account you get the shared Notebook.
Please be a bit more precise to explain your requirement or you can upload a screenshot so that I can get more accurate solutions to this problem. I’m glad to help and follow up your reply.
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