September - last edited September
I'm also having this problem. My sim is a Neophyte and knows two Practical Magic spells and Simeon says he won't teach her because they don't know each other well enough even though they have a full bar and she knows his relationship status, employment status, and all three of his traits. He will teach her potions just fine, though.
Edit: It must just be misdone text--my sim ranked up and he was happy to teach me another spell.
a week ago
I feel like this is also the case for me- where the game is giving me an incorrect refusal message. I kept getting this message from the practical magic sage Simeon despite having a complete full friendship bar. Even when I restarted the game I would still get this message from him. When I advanced in spellcaster rank, I was able to ask him and successfully learn a new spell from him.