Konnected Pro Setup Issue with 2 Sirens

I just set up a Konnected Pro board and have 2 sirens connected to it. In the Hubitat App setup in which you assign which devices are connected to each zone, I assigned one siren to ALARM1 and the 2nd siren to ALARM2. For some reason, I can not get both sirens to sound. Whatever I assigned to Alarm 1 will sound, but not what I assign to Alarm 2. (I DO have the board's toggle switch set to ALARM2).

I can't figure out what I have done wrong. The wiring is correct, so it's something I have failed to do with the software setup. Any ideas how I get them BOTH to sound?