Yeah, i have Yubikey on email now.     There is zero explanation why people got locked out, they just did.

The Point is. Its impossible to get back into Gmail once you are locked out.
The links are useless as you end up stuck in a loop where Gmail says they cant verify its you and so on.

These are the countless posts im seeing from people and i now know this from personal experience. Gmail think, "just make another one" Which is all fine and well unless you need your email to log into exchanges.