And it's not a kobo issue.
Conversion GUI embed fonts does one thing. It may mostly be OK on most readers despite Check in Editor complaining. It puts spaces in the filenames. Using Fix/Auto fix or manual editing doesn't work, makes it worse!
Embed fonts in the Editor Tools does a rather different thing to the Conversion GUI and adds a fonts.css, updates an include in the HTMLs and uses filenames with no spaces. Check then finds no problems. Epub Check finds no problems. It works on everything.
Likely if something is broken on my Kobo Libra in epub2 mode, then it's broken everywhere except the laptop. The Calibre viewer is great to see gross mistakes on paragraph styles, broken links or faulty TOC/NCX. But it has no problem with lots of other broken things. Fonts will work.
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