Hi @Kalfas, Daniel ,
The Word/Excel file info metadata is set in Office Client Desktop Software and won't sync to SharePoint library, they are not the same thing, so in SharePoint Online, it's not available to read these properties using Graph/Rest API.
A workaround is that create related column in SharePoint library which fill the same value as metadata in Word/Excel Desktop Client and read with Rest API ListItemAllFields endpoint:
GET https://siteurl/_api/web/getFileByServerRelativeUrl('/sites/SiteName/shared documents/New Microsoft Word Document.docx')/ListItemAllFields
Reference:
Working with folders and files with REST
Thanks
Best Regards
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