How can I stop my phone from making a text sound on the screen lock?

[AC Question]

how to stop phone from making text sound on screen lock

I know I changed a setting somewhere (probably within settings storage), but now when ever my phone locks it also makes a text received sound and when I have the phone on mute/vibrate it vibrates as if I got a text.

I have a Droid Maxx DE, and I know I could easily reflash, but I'd rather just change this one setting.