No alarm sound after PC is woken up from sleep by it, until I log in

Pretty much the exact issue I'm having, but the workaround proposed isn't available in my specific app.

After updating from 1511 to 1903, I found out that the alarm clock I've been using wakes up the PC as it did before, but doesn't make any sound until I sign in with my password. I assume the workaround would be to disable "require password after waking up", but I'd rather avoid doing that for security purposes. 

I'm ready to use any available alternatives; I need multiple recurring alarms with volume control and ability to wake up PC from sleep automatically.

What are the ways I could diagnose the issue?