S1 assigned fader not changing cue volume

[allbuttonmode]

Hi,
Not at all sure if this is an Avid issue, but I thought I'd try here first.

I work in Cubase 11 (Windows 10). When I set up a cue channel, I want to assign it a specific fader in my recording template (in the Eucon software). So far so good.

But, when using the fader to control the cue volume, although the fader interaction with the S1 works, the volume does not change. It only changes if I use the mouse and select the channel.

Any tips on what to do?