You don't need to embed any fonts. The user can select his/her choice of font. You can post links to Google Fonts.
Since you are publishing on Kobo, what you really need to do is get a Kobo Reader to doubel check your eBooks, Also, are you using epubcheck to make sure there are no structural errors? Are you using styles in Word instead of highlighting and selecting say center or bold? You should check your ePub code to make sure there is no code left from Word that should be cleaned up.
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