If you know the question about the ordinary visa in Australia, please answer it. What you want is experience, and you are not allowed to answer.

As you said, this is an automatic reply, which doesn't make any sense, because it's not the visa officer's email. It's usually an automatic reply. I suggest you call the Adelaide Immigration Bureau directly, give your name and date of birth, and then ask about your progress. Be sure to ask when the agent gave it to you before asking. If the delivery time is more than 4 months, you can emphasize this time issue with the Immigration Bureau. Generally speaking, the results should be almost received in May, but don't worry too much. Call to ask about the progress.

You must send the new COE to the Immigration Bureau, otherwise your visa will not progress. You should have 28 days to supplement it. Please ask your agent at once.