Why won't my LG G6 give me the option to enter my back up pin after forgetting my knock code?

[Android Central Question]

I have tried my knock code at least 20 times and it only increases the time in between attempts.

 

[B. Diddy]

Welcome to Android Central! It says here that after 5 incorrect knock codes, there should be a prompt at the bottom of the screen saying "Forgot knock code?" -- do you see that? LG G6 support - Setting up Knock Code. - Three