I just set up a new Mini and for some reason I can't get the alert sound for Messages to work. If I go to the Message prefs and choose a sound, I hear it. But if a new message comes in, I get a visual alert but no sound. I've checked system notifications and anywhere I could think where sound is an option, and even reset PRAM. Still nothing. No issue with Mail alert sounds, just Messages. I figure this is a Mojave issue and not the Mini, but who knows. Any ideas?