Try copying the tracking number and pasting it. I had to do that otherwise it would continue to say invalid. No, they don't require a signature. Mine was delivered this morning by fedex. They just rung the door bell and dropped the package at the front door. You may be able to ask for signature authorization.
Same here! Got the order confirmation and shipping email quite quickly. But the FedEx number doesn't work from the email link. It worked after I input the tracking number directly on the FedEx website. Mine just arrived today as well (shipped directly from MG to Hong Kong).