Hello Guys. I am a new member to TS3 so please just don't get bored of my questions if they are noobish and many.

Recently, I got a complain from some clients on my TS3 server that they can't see other members in other channels except when I assign them manually at the Normal (791) server group and then they can see them. However, I got bored of doing that manually so I searched for how to make this Normal (791) server group to be the default and I succeeded in making it via the Virtual Server Edit in Tools >> Misc.

However, the clients now receive this error:-
 insufficient client permissions (failed on i_client_max_channel_subscriptions)
Any idea on how to solve it? They are going into the same problem again and again (being able not to see members unless they join their groups)