Steam Br101 Expert Passenger Lights Don't Go On In Single Locomotive Operation

Hello everyone,
I am having some trouble getting the passenger lights to work on the BR101 Expert. So as you can see in the following picture, I turned the Zs button on, and I have no faults in the locomotive. The stor light is only on because I didn't set up the locomotive data.


However, I can't seem to get the passenger lights to turn on. So I held the train light switch in the ON position for 10 seconds, without result. I tried looking back at the preview stream and looked in the manual, but thus far have not found a solution to get them to turn on.

They work perfectly fine when there is a cab car at the other end. So I also tried turning them on when switching between the different Multiple Unit Protocol settings. Is there anyone experiencing the same issue, or am I missing something? Thanks in advance.

PS Please note again this only happens when I have a Loco and some IC coaches. No mods or other things installed.

 

In addition to my previous post, I'll provide a streamable link. Here you can see the other cab. The link is only valid for 2 days, so please notify me if it needs to be uploaded again. What you see is that the lights turn on for a brief moment, only to turn off again when I release the switch. https://streamable.com/ed64z5

 

I've found the issue. After trying to reset the MCB of a coach, I noticed that the MCB handle couldn't be interacted with. Turns out in the timetable mode the non-expert coaches are used.