Search:

There's an official post with a list somewhere, ill dig it up and put the link here

found it
...

Yeah, the Rhapsodies missions are technically complicated, and your ability to interact with certain NPCs and do certain things can depend on your mission progress. In particular if an NPC is...

"Speak to Kupipi in Heavens Tower after completing The Path Untraveled to receive Cipher: Semih."

after, not during. Also especially with NPCs like Kupipi that are involved in many things,...