if you want to use font select on Kobo e-reader, that selection option works only if there is no explicit font family declaration within the book. otherwise the kobo honours what the book css says.
So a simple overlooked font-family:serif; or font-family:sans-serif; in css is enough to disable the on-device selection options
that is based on my experience with sideloading epub & kepub to aura HD but i think all Kobo devices behave similarly.
check the kobo sub forum
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