Can someone tell me what it means when some leads do not load into Marketo due to the following reason? How do I fix this? "Lead exists in another lead partition in your Marketo account - contact your Marketo admin."
It means that your Marketo instance is set up with multiple Lead Partitions and there is at least 1 partition that your Workspace does not have access to (maybe for another business unit?). By default, an email address has to be unique across partitions, so in this case those email addresses already exist in the other partition and it won't allow you to add those. Check with your Marketo admin on possible solutions.