Not only am I back to regularly getting my Apple Account "locked," there's now a new twist where the "unlock" flow returns HTTP 503 responses unless I space out my actions during the process, leaving several minutes between steps—but not too many minutes, or else the whole thing times out! I've been trying to unlock my account for ~30 minutes so far…
(My session timed out again. I'm not sure if I'll ever be able to unlock it. This is my developer Apple Account, BTW.)
I did it! I had to tether my Mac to my phone to do it, which points to some kind of FiOS issue. (My phone is also Verizon.)
@siracusa Time to subscribe to Apple One +, now with higher rate limits!
This is the error that appears on the web page when some part of the execution of a step gets a 503 response.