Is it possible for us to delete external activities?
Deleting external activities once uploaded
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No, it is not possible.
Once an external activity is uploaded, there is no way to delete this activity including through the API.
Support also lacks the ability to delete these external activities.
For more information regarding External Activities, please refer to Eloqua's External Asset Documentation.
Please note that It may be possible to stop the status from being passed to the CRM if the status associated with the External Activity is modified to one that does not generate a response before the data is sent to the CRM. However this cannot impact data already sent to the CRM.
Also, I would recommend you to review below documentation: