Enable electron-app avatars?

I remember when using the electron-app with the official server, it generated random pictures for an avatar based on the name with which we joined, but then they were gone and we had just initials.
I want to enable them in my own jitsi server instance. I found little info about, the closest is one post 10 months ago. Uncommenting this line in my config.js doesn’t change something:
gravatarBaseURL: 'https://seccdn.libravatar.org/avatar/'
but maybe this line is about fetching existing remote avatars.

Is this feature still available and if yes, where is it configured?

Randomly generated avatars are gone, sorry, there is no option for it.