MTR 4.6 Team/Two-Headed Giant Communication

Members of the same team may communicate between one another except during times where explicitly prohibited by the team format rules.

However, team members that have an opportunity to acquire hidden information (e.g. by speaking to spectators following their own match while a teammate is still playing), are restricted from communicating with teammates for the duration of that match.

Prohibitions against written notes of any kind during drafts apply to team drafts as well.