Welcome to the user-to-user forum, @zirk.jansen! 
Yes, I would be interested in hearing what firmware version you are using also (not ‘latest’, as there are latest Beta versions too).
I just tested this with one of my V3 cams using production firmware 4.36.9.139, and I get audio on the shared account.
At first I thought this might be implementing the following wishlist item, but apparently not?