Kobo checks both file name and metadata. They must both be properly done. I am using TransType 4 for editing metadata but you check them with free FontForge.
By the way, objectively speaking Kobo Nickel is a bad text typeface. Spacing between letters is too big and x-height is too small. I don't know who designed it for Kobo but it really isn't good. I am not saying that it is unreadeable, but this is not how a text type should be.
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