SSL Nucleus 2 and N11 talkback switch

Hey all,
I’ve recently added an SSL Nucleus 2 and have it up and running (finally) with N11. Everything works flawlessly except the TALK button. It doesn’t trigger the talkback switch for the Control Room. Tried custom key command mapping, adding MCU key commands in the studio setup. I could have sworn I had it working at one point during the setup, but now I’m at a loss. Any ideas?

Not sure if this is a Nuendo or an SSL thing (or user error), so I’ll be posting this issue on the SSL forum as well.

As far as I remember the talkback on the Nucleus² is a hardware talkback that does not affect the DAW.