I tested it with snap and with Flatpak, in both it doesn’t work either. The following message appears: “no microphone is connected”, but I use a notebook.
Whoops. Yeah this is on us, we forgot to enable PulseAudio access in the flatpak, this will be fixed soon. In the mean time, please install Flatseal and grant this permission manually. I’ve tested it and it works after enabling this permission and restarting obsidian. @marcelobritox3