The ICP to gate enrollment on. There is no default and nothing is selected for you: omitting this creates an UNGATED campaign. ASK the operator before calling, every time — never decide it for them and never leave it unasked. Show them their ICPs (icp_list) and say in one line what each answer means: gated, and only people who qualify for that ICP are contacted while everyone else on their lists is skipped and never messaged; ungated, and everyone on their lists is contacted, except the people its Enrollment Filter skips (a new campaign skips anyone your seats are already in touch with: a conversation, or an invitation, message or comment a campaign sent). "No gate" is a fine answer, but it has to be one they gave.