I've had the same issue with buying and selling accounts - my buying account got locked out, which prevented me from logging in to my selling account, with 50 p

I've had the same issue with buying and selling accounts - my buying account got locked out, which prevented me from logging in to my selling account, with 50 pending orders at the time. Luckily I emailed jeff@amazon.com and got my main account unlocked within 2 days and my buying eventually got back a week or two later. Seems like they still haven't fixed the underlying issue of bots locking accounts across services.