I am making a request to get the Contact Activity Detailed Report. The response is a HTTP 400 with the following message:
"error_message": "Unknown activity tyep: v_regist"
See the attached image for the request
After investigating what you have experienced, I found that this is an issue that can cause the summary tracking data to be unavailable for some contacts who have registered for an event, or declined an event invitation. This is something that we will be working to prioritize so that we can work on getting a fix for this in place.
For the immediate term, the best solution is to request tracking data of a specific type(Bounces, Clicks, etc) rather than requesting the summary data.
If you have any questions, please let me know!
Wanted to share that we have released a fix for this defect and you should no longer be seeing this error. Thanks for reporting it!