2 factor authentication without authorization

Apropos my second question, here is a quote from Apple:

"If you recently updated your account, you can unenroll within two weeks of enrollment. Just open your enrollment confirmation email and click the link to return to your previous security settings. Keep in mind, this makes your account less secure and means that you can't use features that require higher security."

I NEVER RECEIVED SUCH AN EMAIL.

My AppleID is years old.

I started using Homekit about a week ago.

That's not what the quote from Apple that I referenced above says.

That was not the best answer and the question has not been answered so the problem has not been solved.