You should get an instant “90 day report” received email, stating it’s not a reply or confirmation of filing just that the system has the filing and is awaiting a human to confirm.
If you haven’t go that then check your spam settings/folders and see if it’s got blocked.
Usually takes at least a day or two to get a confirmation (or rejection). As
@Bra****
said. You have a fall back of 7 days after due date to file in person if you don’t get a response.