Ben2025 hey Ben, after checking my LC with the Shannon FIR installed, I get the same issue as you. I believe that maybe the voice recognition is only set up for the London FIR, as the shannon FIR is an addon.
This also makes sense as the Shannon FIR doesn't have the same waypoints as the London FIR, so they are not included in the main game's speech recognition. Maybe there is a way to create a vocabulary for the Shannon FIR but I don't know, I don't know hwo to create FIRs.