Rayban meta GEN2 and Oakely Vanguard NOT Playing WhatsApp Audio Message - Android

Rayban meta GEN2 ISSUE with Playing WhatsApp Audio Message - same issue with my other pairs of Oakely Vanguard. 

I've two pair of RayBan meta gen2 "Headliner + Wayfarer", and few days ago the Headliner start the issue and today also the Wayfarer.

Each is connected to a different phone with different setups, but now both RayBan, when asked to play the just received WhatsApp voice message, they are muted, like they are playing a mute message...

It never happened before, all the audio commands and speakers works good on other applications...

We reset both glasses, reconnect, ans troubleshooting but nothing changes...

Anyone has the same issue?