OneNote Create Page error: has reached limit

Hi

I develop a Power Automate flow and use Graph API to create pages. It worked. But I got receiving an error: "The section has reached its maximum size and cannot have any additional content added to it." I have not found any limits on Microsoft documentation other than free space on OneDrive/SharePoint.

The notebook is located on user's OneDrive and the user has 50% (500 Gb) free space.

So could you please advise what other limitations do we have working with OneNote via API?

Thanks in advance.

Slava