[CentOS] C7, pulseaudio, multi-user setup

Hello there,

I'm on a CentOS7 laptop, in a Mate session w/ my default user, and in that desktop, I run apps from other users using sudo, su. It appears that apps started using sudo or in terminals+su, can't play sound:

[pulseaudio] main.c: User-configured server at {f7ac68929370425d82f882c116a21597}unix:/run/user/1000/pulse/native, refusing to start/autospawn.

User 1000 is my default user. I've searched and read a lot about this topic, and found many suggestions but none works so far.

What's the correct way to allow all users to play sound in my default user's desktop session? Adding them all to the audio group doesn't seem to be enough (at least).

Regards,