Channel members always empty on voiceStateUpdate

[bezooomec]

I want to fetch all current members in voice channel.
At first, all priveleged intents was enabled in discord web interface. Bot added to guild as admin.
Second, bot.Identify.Intents = discordgo.IntentsAll was enabled.

Using voicestate update, seems impossible to get channel members with every approach I know

func voiceStateUpdate(s *discordgo.Session, v *discordgo.VoiceStateUpdate) {
...
	ch, _ := s.State.Channel(v.ChannelID) //members len 0 cap 0
	ch2, _ := s.Channel(v.ChannelID) //members len 0 cap 0
	g, _ := s.State.Guild(v.GuildID)
	cha := g.Channels //members in specific channel (lookup on breakpoint) still len 0 cap 0 
...

so, where should be an issue and are there different approaches exist?