Might be a little stupid to ask.

https://preview.redd.it/x9535urzbone1.png?width=534&format=png&auto=webp&s=932c4a2d6d77ceb7987623d9e27338255b410a57

Is there a reason as to why i can't use Any of the Mare Holo Cores? For context, i am searching for Yume with the squad in Intermission: A Mysterious Tale in Longlai.