The conditions for Minsala to join the team in Baldur's Gate 3 are to recruit characters with similar personalities and favorability. One thing to note is that you can't bring in characters who are hostile to him because it will lower the favorability between each other.
Answer: Pay attention to each other’s favorability and personality
When players join Lamin Sala's team, they must note that his enemies cannot join the team.
If the personalities and preferences are different, the favorability between each other will be reduced, and you will be able to leave the team and not be able to re-enter.
When you first meet, you must help the goblins massacre tiefling refugees and oppose the druids.
Laminsa cannot enter the team because they are hostile and can reduce the player's favorability.
