I just had one niggling problem with an embedded font, showed fine in Sigil, calibre, ADE etc. but didn't show on reader.
The problem was an incorrect font-face and stylesheet error, I had an Italicised font, but in font-face definition had 'font-style: normal;' yet in style-definition had 'font-style: italic;'.
This as I said showed up properly in the desktop software, but not on the readers.
When I realised the error and adjusted the font-face definition to 'font-style: italic;' to match the style (and what type the embedding font actually was) then it also showed up in the reader as well.
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