Not that easy to find out what went wrong from a Remote perspective.
I tried the ctl-al Trick when i had a MD and it worked just like in the vid.
Are you sure you didn’t miss a step?
Have you set trigs in your ctl-al track? I think this is needed to get the locks there.
Are you in Realtime-rec mode (blinking rec LED?).
Sometimes i forgot to enter the realtime mode and still was in normal rec mode…