I tried but my account got flagged for extra validation. This requires me to take a form to a bank or brokerage so that someone there can verify my identity and then stamp the form with some special stamp. Well I do my banking with online banks so I have no access to a brick and mortar branch nor do I really have the time or inclination to try to talk to somewhere there and get what they're asking for.
I actually needed one earlier this year. My bank no longer had a special signature person at the branch so they sent it to special signature central--which somehow didn't have the info they needed even though the bank branch sent it to them. Ended up just doing the longer drive to my broker and handling the transaction there.