I tried to join a team match between two groups that i am member of, but there was "join match" button. i am already playing in two team matches and a tournament. Is it because i am a free member (will upgrade soon) and there is a limited number of matches i can join? (in the help section i found a limited number of tournaments but not team matches) Or is it because i am member of both groups?

Regards,

ImadStein.

No, it's because you're a member of *both* teams.