Hi Robert,
Welcome back - long time!
System keyboard shortcuts take preference. You may have noticed your dock appearing and disappearing while pressing opt-cmd-D?
Go to System Preferences > Keyboard and uncheck the box for the system shortcut. It will now respond as desired within ARCHICAD.
Cheers,
Karl
One of the forum moderators
AC 28 USA and earlier • macOS Sequoia 15.2, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB