Apple has, for a while now, offered two separate additional security measures to protect your Macs, iOS devices, and iCloud account, but thanks to some inexpert nomenclature, it can be a little difficult to tell them apart
I’m glad Dan Moren figured this out and wrote it up, because Apple sure didn’t make it easy to even know that there was a newer, better option than the original two-… uh, factor? Step? I already forgot which is the old one and which is the new one. Whichever it is, switch to the new one.