Audio notification is playing for every chat message

I’m getting a sound effect playing whenever any message appears in the chat. Regular team/match chat messages, “my ultimate is charging” type ones, DMs, everything plays the same sound. I can’t find anything in the options that seems to match this.

It’s the same sound effect that plays in OW1 when a friend comes online.

Same here, it’s a small thing but it’s driving me slightly mad.