Did u solve it? I have the same problem.
Hi,
I suppose you’ve got a wrong parameter somehere on the API or the plugin settings.
I just tried this plugin for the 1st time and it works great : The instructions are not very clear because the MS API platform has changed. It can be confusing.
I’ve made this for you (in french sry) :

Try to follow these steps to link the WP plugin to your MS Api. Don’t forget so save (bottom of the page), I got the same error because I didn’t save…
Once you linked it, clic on the OneNote icon in the WP text editor, and you should get the classic MS popup which allows to grant access to your account. Just clic Yes. Enjoy.
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This reply was modified 9 years, 8 months ago by
pierrickdz.
Thanks!
I does not work… It may be because I don´t write the correct in 4.
What do I have to put on 4?
The provided value for the input parameter redirect_uri is not valid. The scope office.onenote wl.signin wl.basic wl.offline_access requires that the request must be sent over a secure connection using SSL.
How can I use SSL???
Thank you very much!
The problem is now that when I click the OneNote button on the editor, the popup shows… my wp-admin!
As suggested in another topic, I tried to replace http://www.mydomain.fr/wp-admin/ by https://www.mydomain.fr/wp-admin/, but of course it doesn’t work since I don’t have any SSL certificate.
Could you help me further?
Thanks again.
any sollution ???
i have the same problem :/