Because simply put IMO and based on my most recent experience E-trade has no issue accepting HMGP certs.
Perhaps you need to get an E-Trade manager that way you can get someone at a higher authority involved or make sure that you are filling out the cert the proper way.
One problem with E-trade can be the low level people that work the customer service end. That I have found to be an issue in the past with E-trade
Register for free to join our community of investors and share your ideas. You will also get access to streaming quotes, interactive charts, trades, portfolio, live options flow and more tools.