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It would help if you answered direct questions with a simple Yes or No Ψ³
If you open the epub in the OneDrive folder with calibre's ebook-viewer, can you see the Comments when you show the metadata?
It's the 3rd last button in the viewer. If you can't then see the second paragraph in post #2.
Otherwise, are you sure the Apple Books app is reading the epub file you uploaded to OneDrive and not some version its squirreled away in a cache?
BR
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