Hey there @lewis-walker-1 ,
You are correct with the article you found in that that the feature is automatic and should only occur in rare instances, usually when either the email might be suspicious; usually I’ve seen it when the owner of the site tries to log in with a similar email or the same email.
I tried following the steps within the article but the 6-digit code verification does not happen on my end. I did get a similar popup letting me know the email needs to be verified on mobile but I can scroll the popup on my end.