I don't know exactly what you're doing wrong but I'll repeat some rules I've seen some players misread/forget about:
- Murasaki wants to be in a team with Uzomi, Alex, and Detah, but he's fine with only two of them
- Mako wants to be in a team with Lare or Murasaki
- Alex doesn't want to be with Mako or Detah
If you had already completed all those rules but the game still says you're doing it wrong (I've seen it happen), then you should close and reopen the game and put the correct combination again. I don't know what causes that glitch so I don't know how to fix it but yeah, that's how I've seen it get fixed
Thank you for playing! :D