The sync between EngagementHQ and Campaign Monitor brings across ALL participants, regardless if they are activated or not, imported or not or even blocked.
If you see a difference in numbers, consider this:
- Your EHQ Participant List includes Project Administrators. They are NEVER synced.
- Your CM account has a suppression list that includes emails address of people who have previously unsubscribed from your emails. We are NOT syncing those emails from EHQ to CM.
- The lists are not updated in real time, but only when a sync occurs. Depending on when you check, the most recent registered participants in your EHQ might not be synced yet.
To check your suppression list, see this help article from Campaign Monitor