On .clj files instead everything seems to be working fine, so my suspicion is about the .fnl not activating the custom settings for conjure?

Hmm are you using leader or localleader? I'm guessing you're using the correct one since it works in Clojure.

Are you running the school script from the CLI or installing Conjure and running :ConjureSchool?

Local leader, as per guide on the website, thank you. Regarding the second point, I've ran :ConjureSchool from nvim

Sorry! I can't keep track of all the lines of communication and forgot about this. If you're still struggling opening an issue would help me track it, but I'll try to help you out again soon. If you're not bothered by it now and moved on that's okay too!

Sure, nothing too relevant. Thank you so much