Has anyone else had issues sending emails to campaign members? I've had no issues sending emails via custom segments. I've mapped the specific campaign's contact record campaign member ID to the campaign member DMO. I'm unsure what else to check in terms of mapping. I keep getting a population segment of 0.
I’d double-check the Campaign Member DMO mapping and, more importantly, the criteria being used to build the population segment. Having the Campaign Member ID mapped correctly doesn’t necessarily mean the campaign members will qualify for the segment.
I’d also compare the campaign-member records that you know should qualify against the segment’s filters and make sure the relevant contact/individual IDs are resolving correctly. Since custom segments are working for you, that comparison could help isolate whether the issue is with the Campaign Member relationship rather than the email itself.
If the goal is ultimately just to send campaign emails to Salesforce Campaign Members and the Marketing Cloud setup is becoming unnecessarily complicated, another option is using a Salesforce-connected email platform such as MassMailer for the sending side while keeping Salesforce Campaigns as the source of your audience.
