The error message "Cannot Perform 'Post' on objects of type 'SentEvent'" indicates that the SentEvent object is not updatable via the SOAP API. The SentEvent object is typically read-only and is used for tracking purposes.
Read-Only Object: The SentEvent object is used to log events and is not designed to be modified via API calls. This is why attempts to perform POST operations on it will result in an error.
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