I am using Teams for the 1st time with the rest of my department and I am trying to set up my channels with sub channels, which I have just discovered I can't but I've received a message to say we are at capacity and I cant add anymore channels.
Your max channel limit is 200 channels. When you create channels you can choose to auto show them for your users in the Team, You can have a max of 10 of these set to auto show at any given time.
All you have to do is uncheck the auto show box if you need to create many channels. You can then tell your users to go click on the channels they want shown in their lists. But at any given time you can only have those 10 at any one time.