My first post

I just beat “The Ogre’s Alliance” and Eyedol requested to join my team so I accepted. I got a message saying my team is full and I have to get rid of someone so I chose Cinder. Afterwards Eyedol is nowhere to be found… Do I need to restart my game or is there some type of glitch?
If this is something that has been discussed before then I apologize and completely understand if this gets deleted.

Usually, when the turn is over the character you dropped will be replaced by the new one. So, you have to skip a turn or use all your characters during a turn and then your new team member is selectable.