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Hi Canary,
It seems that the tutorial you've read is this one:
Share it: Embed an Excel workbook on your web page or blog from OneDrive
Actually, this article applies to Excel workbook located in OneDrive.
For your requirement, to embed an Excel workbook which is located in OneDrive for Business library, please refer to this article: Embed your Excel workbook on your web page or blog from SharePoint or OneDrive for Business
Thanks,
Frank