[s2]Pandora’s Box: impossible to get Jin’s key

So basically I’m doing jin’s route, I’ve given him every heart and gift following guides and when the Pandora’s Box chat comes up I pick up the “right” answers and he’s still saying “no” to the last question, therefore making it impossible to get his key. My level of attraction is 40-60% I think (despite not flirting with anyone else) and the speed is at 60%. Has anyone else experienced this? Is the attraction level perhaps not high enough? Will I be able to get his good ending without the key? Thanks 🩷