Sorry for the slow update time. I was unfortunately traveling last week and wasn't able to post as much as I usually can. We found the cause of the problem (which has to do with our updates to our new Contact Management system). We backed out the changes as we resolve the bug we found and are working on a solution now.
As for the missing error messages, our new Contact Management platform does not provide detailed error messaging on imports today. This is a feature that will be coming in the future and when we put these updates back in, these error messages will no longer be returned. We have escalated this to our Contact Management team as a critical feature we need to add in as our developers count on this. At this time, I can't share when we will get that feature added but we're hoping that it is sooner rather than later.
Also want to clarify what we are rolling out, it will be in our next set of release notes but here is a sneak peak. As mentioned in some other threads, we are having some performance issues with our bulk imports on our new Contact Management system. We are in the process of building an entirely new bulk import service that uses that same import flow as our new Contact Management UI. We had rolled that out last week but ran into some synchronous processing issues as reported by you in this thread. We are resolving those issues and then will roll this new import service back out to developers. It will have all of the same features and performance as our new UI import flows.
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This is a similar post to one in another forum category. This is an open issue on our side and we are working resolving it.
Here is a more detailed answer: https://community.constantcontact.com/t5/Developer-Support-ask-questions/Bulk-activity-reports/td-p/165199
Here is a workaround using the API with existing functionality: http://developer.constantcontact.com/docs/bulk_activities_api/bulk-activities-summary-report-api.html
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