Turns out your Wizard needs to have a Spellbook item in their bags before learning spells. As far as I can tell this is never explained in the game (on the Spellbook item, the levelup screen or the preparation screen) and is not a requirement for the first 2 levels of spells (??).
This looks suspiciously like a bug, even if it isn't one and if it weren't for some year-old thread I dug up through google I would have never figured this out. The game should seriously hint at requirements like this.
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