I previous user asked this and then answered their own question by stating "handled it like a rebranding problem". I have no idea what they did or what that means.
I expect that what they mean by that is this:
I still have all but five accounts at Ameritrade, and all of them stopped updating. The one account they switched to Schwab updates fine.
So should I use steps 2 and 3 and see if they update?